Quick Answer
The most reliable fix is to simmer the curry uncovered over a gentle heat, stirring so it does not catch, until enough liquid has evaporated. If it still needs help, stir in a smooth cornflour paste, a spoonful of cooked red lentils, ground almonds or a little mashed potato. Add yoghurt off the boil, in small amounts, so it does not split.
Key Takeaways
- Reduce first. Published guides suggest roughly 15 to 30 minutes of uncovered simmering before you reach for anything else, and a wide pan speeds it up.
- Lumps come from adding dry starch or flour straight to hot liquid. Mix it to a smooth paste with cold liquid first, pour it in slowly and simmer for a couple of minutes.
- Dairy is the riskiest thickener. Use full-fat yoghurt, add it gradually at a gentle heat, and know that a split sauce has no guaranteed fix.
If you are asking yourself “how do i thicken a curry that has come out too thin”, start by working out why it is thin, because that decides which fix suits. A watery tomato curry, a creamy korma and a chicken stew all want slightly different answers. This guide compares the common options, explains where lumps come from and covers what to do when a sauce splits.
A note on sources: the amounts and timings here come from published cooking guides and recipes, and they do not always agree. We have not run our own kitchen test, and where guides differ we say so.
How do I thicken a curry? Reduce it first
Reducing means letting liquid evaporate. It adds no new ingredient, which is why most of the guides we read start with it.
How to reduce curry sauce
Take the lid off and keep the pan at a steady simmer. One guide, Liana’s Kitchen, suggests simmering for about 15 to 30 minutes, keeping the heat low enough to avoid scorching the base. Piping Pot Curry advises stirring at regular intervals so the curry does not burn, and a wider pan helps because more of the surface is exposed.
Do not turn the heat off the moment the sauce comes to the boil. MasterClass says a curry must simmer to cook off excess liquid, and that very low heat or too short a cooking time are common reasons curries stay thin.
Why is my curry watery and how to fix it
MasterClass lists the usual causes: frozen ingredients added while still frozen (they release liquid as they thaw), light coconut milk, heat that is too low and cooking time that is too short. The fixes follow from the causes: thaw and drain first, use full-fat coconut milk or coconut cream, and let the sauce simmer uncovered until it clings to a spoon.
Fixing runny chicken curry
For runny chicken curry, remove the lid and let the sauce reduce while the chicken finishes cooking. Rachel Phipps’s chicken passanda recipe simmers uncovered for 15 minutes until the chicken has cooked through and the sauce has thickened. Bring the sauce up to a bubble first, then drop the heat.
How to thicken curry naturally
If you would rather not add a starch, several methods work with ingredients already in the pot or cupboard: reducing, puréeing some of the vegetables, a spoonful of lentils, ground nuts, or an onion and tomato base cooked down properly. They are covered below.
Cornflour slurry: how to thicken curry with cornflour without lumps
Cornflour is the quick fix. A slurry is just cornflour mixed with cold liquid until it is smooth, so it can spread through the sauce without clumping.
How to thicken curry with cornflour
- Mix the cornflour with cold water until completely smooth. Fuss Free Flavours says to use equal parts by volume, while Freee Foods mixes 2 to 3 teaspoons of cornflour with 2 to 3 tablespoons of cold milk or water for stews. Both are fine to start with.
- Never add dry cornflour straight into the hot pan. Fuss Free Flavours is firm on this.
- Pour the slurry in slowly while stirring constantly.
- Bring back to a gentle simmer and cook for a couple of minutes. This thickens the sauce and cooks out the raw taste.
- Stop adding when it looks right. Fuss Free Flavours warns that too much makes the dish gummy, and overcooking can make it thin again.
How much you need depends on the volume of liquid. Fuss Free Flavours suggests about 2 teaspoons of cornflour per 4 cups (roughly a litre) for moderate thickening. A cooking guide on a US site, Insanely Good Recipes, suggests a tablespoon of cornstarch per cup (240ml) for stew, which is a much thicker result. Start with the smaller amount and add more only if you need it.
Cornflour does not suit every curry. Nigella’s team advises against flour or cornflour for a thin Thai-style vegetable curry, suggesting less stock instead, because that style of curry is meant to be slightly soup-like. Freee Foods also notes that sauces thickened with cornflour can be difficult to reheat and are best for immediate use.
Cornflour for stews
The same method works for stew. Freee Foods suggests taking the pan off the heat, stirring about a cup of warm liquid into the paste, then pouring it back into the hot stew and stirring well before returning it to the heat.
For more on the name, see our guide to cornflour or cornstarch: are they the same thing?.
How to thicken curry with flour
Flour works in a similar way. Liana’s Kitchen says to mix 2 teaspoons of flour per cup (240ml) of liquid with enough water to make a slurry and stir it in near the end, stirring constantly because it can stick to the bottom of the pan if overcooked. Insanely Good Recipes gives a lighter figure of 1 1/2 teaspoons per cup, simmered for about 5 minutes to cook out the raw taste, and says not to add flour directly to the stew.
A roux is the other route: cook equal parts fat and flour together for a few minutes before adding the other ingredients. Liana’s Kitchen gives 2 tablespoons each per cup of liquid, while Piping Pot Curry uses 1 tablespoon of each, so the guides disagree on quantity. Start small.
How to thicken curry without cornstarch
Cornstarch is the American name for cornflour, so if a recipe says to avoid it, the same applies to cornflour. You still have plenty of options: simmer to reduce, use flour or a roux, stir in ground almonds or a spoonful of lentils, or purée some of the vegetables. MasterClass also lists tapioca starch and arrowroot as slurry alternatives.
Nuts, yoghurt and coconut
Thickening curry with ground almonds
Ground almonds are a common choice for creamy curries. Rachel Phipps’s chicken passanda stirs in 3 tablespoons of ground almonds with 150g of full-fat natural yoghurt and simmers uncovered for 15 minutes. MasterClass suggests adding ground cashews or almonds during the remaining cooking time if the sauce looks runny. Check for nut allergies before serving, and do not assume guests can eat them.
How to thicken curry with yogurt
Yoghurt thickens a little and softens the heat, but it is the most likely thickener to split. Practical rules from the guides:
- Use full-fat or Greek-style yoghurt. Krumpli says low-fat yoghurt is the number one cause of a split sauce.
- Let it warm up out of the fridge first. Krumpli says this helps prevent splitting.
- Add it a little at a time, stirring constantly, over a very gentle heat (Liana’s Kitchen).
- Do not boil the sauce once the yoghurt is in (Krumpli).
Piping Pot Curry goes further and says not to add yoghurt while the curry is still hot. Rachel Phipps’s recipe stirs yoghurt in with the other ingredients and brings it to a bubble before dropping the heat, so cooks differ on timing. If you are unsure, take the pan off the heat and let it settle before adding.
Thickening curry with Greek yogurt
Thickening curry with Greek yogurt follows the same rules as above. Piping Pot Curry recommends full-fat or Greek yoghurt for this. Stir it in slowly at the end, in small amounts.
Does heavy cream thicken curry?
MasterClass lists heavy cream (double cream in the UK) among the dairy options alongside Greek yoghurt and coconut cream, but gives no amounts or timings, and we did not find a source that measures how much it thickens. Treat it as a way to enrich the sauce and add a little body at the end, over low heat, not as a strong thickener.
Using coconut milk to thicken curry
Full-fat coconut milk or coconut cream gives body. MasterClass warns that light coconut milk or coconut water will be too watery. Liana’s Kitchen and Piping Pot Curry both advise not shaking the can: scoop the thick cream from the top first, then add the thinner liquid as needed. Coconut suits Thai, South Indian and other Asian-style curries best.
Potato and lentils
Thickening watery curry with potatoes
Potato works two ways. Mashed or puréed potato stirred in thickens the sauce, and Insanely Good Recipes suggests simmering it uncovered until the stew thickens. Alternatively, purée a share of the vegetables already in the pot. Liana’s Kitchen and Piping Pot Curry both suggest taking out about a quarter of the potatoes, squash, carrots or legumes, blending them and stirring them back in. This adds no fat, flour or nuts, so the flavour stays the same.
How to use lentils to thicken curry
Red lentils soften and break down as they cook, absorbing liquid. Piping Pot Curry suggests around 2 tablespoons of cooked red lentils, and Liana’s Kitchen says 1 to 2 tablespoons. MasterClass advises adding lentils about halfway through cooking and then checking the thickness once they are fully cooked, so you do not overdo it.
How to thicken vegetable curry
For a vegetable curry, puréeing a quarter of the vegetables is the easiest route, since the thickener is already there. Liana’s Kitchen advises adding potatoes and other vegetables only after the sauce has thickened slightly, so they do not overcook while you reduce it.
Onion and tomato: building thickness from the base
How to use onion paste to thicken curry
A properly cooked onion base is a thickener in its own right. Piping Pot Curry says that when the onion and tomato paste is cooked for a further 15 to 20 minutes, a layer of oil begins to appear on top, which is the sign it has cooked down.
Can you use tomato paste to thicken curry?
Yes, but it changes the flavour. MasterClass says to add more tomato paste or purée for a denser sauce, and warns that you may need to adjust the other seasonings or vegetables to balance the extra tomato. Liana’s Kitchen adds that it is best in recipes that already contain tomatoes and should go in at the start of cooking so it mixes in fully.
How to thicken a tomato based curry sauce
For a tomato based sauce, simmer uncovered first, since reduction is the first fix every guide offers. If it still needs body, add a little more tomato paste at the start of cooking as the guides above describe, or purée a share of the vegetables.
Fixing a sauce that has split
A split sauce looks grainy or separated, with fat or whey pooling out. It is most often a problem with yoghurt or cream, and it is easier to prevent than fix.
Prevention is the best strategy: full-fat yoghurt, brought to room temperature, added gradually over a gentle heat with no rapid boiling afterwards. One source, MacMyths, says there is no dependable rescue method for every broken yoghurt gravy, and that reheating, blending or adding another ingredient may change the texture but should not be treated as a guaranteed fix. Krumpli says stabilising yoghurt with flour is possible but not recommended, as it can make the sauce gloopy.
If it splits, take the pan off the heat. Try a gentle stir and, if you want to experiment, a quick blend, but accept that the texture may not recover fully. Serving a slightly broken curry over rice is usually better than overworking it.
Which method suits which dish?
This is a summary of the published advice, not the result of our own testing.
| Method | Suits | Watch out for |
| Reducing | Almost any curry or stew | Scorching, so stir and keep the heat gentle |
| Cornflour slurry | Stews and sauces for immediate eating | Lumps if added dry, gumminess if overused, hard to reheat |
| Flour slurry or roux | Stews and gravy-style curries | Sticking to the pan, raw flour taste if undercooked |
| Ground almonds | Creamy, mild curries | Nut allergies |
| Lentils | Vegetable curries and others where lentils fit | Add gradually and check the thickness once cooked |
| Potato or puréed vegetables | Vegetable curries and stews | No cautions stated in the guides |
| Yoghurt | Finishing creamy curries | Splitting if hot or low-fat |
| Coconut cream | Thai and South Indian style curries | Light coconut milk is too watery |
Frequently Asked Questions
What is the best way to thicken a runny curry?
Simmer it uncovered over a gentle heat first, because that thickens the sauce without changing the flavour. If it still looks thin after 15 to 30 minutes, add a smooth cornflour paste, a spoonful of cooked red lentils, ground almonds or a little puréed potato.
Why is my curry watery?
Common causes include adding frozen ingredients while still frozen, using light coconut milk, cooking on too low a heat and not cooking for long enough, according to MasterClass. Simmer uncovered to let the extra liquid evaporate, and use full-fat coconut milk next time.
How do you stop cornflour going lumpy?
Mix it with cold water or a little cold liquid until completely smooth, never add it dry to a hot pan, and pour it in slowly while stirring. Bring the sauce back to a simmer for a couple of minutes so it thickens fully.
Can you thicken curry without cornflour?
Yes. Reduce the sauce by simmering, or stir in ground almonds, a spoonful of cooked red lentils, mashed potato or a flour roux. Puréeing a quarter of the vegetables from the pot also works, and adds no extra fat or flour.
How do you stop yoghurt splitting in curry?
Use full-fat or Greek-style yoghurt, let it warm up out of the fridge, and add it a little at a time over a gentle heat. Do not boil the sauce once the yoghurt is in. Low-fat yoghurt is the most common cause of splitting.
Can you fix a curry that has split?
There is no dependable fix. One source says reheating, blending or adding another ingredient may change the texture but cannot be relied on to restore it. Take the pan off the heat, try a gentle stir, and prevent it next time with full-fat yoghurt added slowly.
