Why Butternut Squash Belongs in a Red Curry

Thai home cooking is a masterclass in balance. A good red curry should be creamy, aromatic, gently spicy and shot through with sour, salty and sweet notes. Butternut squash is the perfect vegetable for this job. It is dense and sweet, so it soaks up the coconut milk without turning to mush. Unlike courgette or aubergine, it does not release water into the sauce. Instead, it thickens the curry naturally as it simmers, giving you a velvety body that clings to rice. When squash is in season in the UK – from late summer right through winter – it is cheap, abundant and full of flavour. Its natural sugars also temper the chilli, so even a generous spoonful of curry paste stays approachable. And that final scattering of crispy shallots? That is the contrast that lifts the whole bowl from good to memorable.

Ingredients for a Vegetarian Red Curry

This recipe serves four generously. Use metric measures and trust your tastebuds – Thai cooking is not about rigid rules.

• 1 medium butternut squash (about 800g), peeled, deseeded and cut into 2cm chunks
• 2 tbsp coconut oil or neutral rapeseed oil
• 3–4 tbsp Thai red curry paste – check the label, as many contain shrimp paste
• 1 x 400ml tin full-fat coconut milk – do not shake it
• 200ml vegetable stock or water
• 4–6 kaffir lime leaves, torn
• 1 tbsp light soy sauce or tamari
• 2 tsp palm sugar or soft brown sugar
• 1 tbsp lime juice, plus extra to taste
• A handful of Thai basil (or regular basil)
• For the crispy shallots: 3 shallots, thinly sliced, and oil for frying – or a small tub of ready-made ones
• Optional: sliced red chilli, roasted peanuts, fresh coriander

The curry paste is the backbone of the dish. A good shop-bought paste is perfectly fine for a weeknight. Look for one that is labelled vegetarian or vegan, or make your own if you are feeling ambitious. Full-fat coconut milk is non-negotiable for creaminess; the light version will give you a thin, watery sauce. And do not skip the sugar and lime – they are what make the flavours sing.

Step-by-Step Method

Open the tin of coconut milk without shaking it. Spoon the thick cream from the top into a wide pan or wok and heat over a medium flame. When it sizzles, add the curry paste. Fry for 2–3 minutes, stirring constantly, until the paste is fragrant and the oil begins to separate. This step blooms the spices and is the difference between a flat curry and a vibrant one.

Add the squash chunks and stir to coat them in the paste. Cook for 2 minutes, then pour in the rest of the coconut milk, the stock, lime leaves, soy sauce and sugar. Bring to a gentle simmer – not a rolling boil – and cook for 15–20 minutes, until the squash is tender but still holds its shape. Stir occasionally.

Taste and adjust. Add the lime juice, then more soy sauce if it needs salt, more sugar if it needs sweetness, or a little extra curry paste if you want more heat. If the sauce is too thick, splash in water. If too thin, simmer uncovered for a few minutes. Remove from the heat and stir through most of the basil. Serve with jasmine rice, topped with crispy shallots, the remaining basil, chilli and peanuts.

The Crispy Shallot Difference

Texture is often the forgotten element in curries, but Thai cooking loves contrast. Crispy shallots are the easiest way to add crunch. You can buy them in Asian supermarkets or larger supermarkets – look for ones that are golden and crisp, not dark brown. If making your own, slice shallots thinly, fry in oil at 160°C until just golden, then drain on kitchen paper and salt immediately. They keep for a week in an airtight jar. Sprinkle them generously over the curry just before eating. They cut through the richness and add a savoury note that is utterly addictive. Fried garlic or crushed peanuts work well too, but shallots are the classic choice.

Serving, Variations and Storage

This curry is a weeknight hero, but it is also flexible. Serve it with jasmine rice, coconut rice or rice noodles. For extra protein, add fried tofu, tempeh or chickpeas. Quicker vegetables like red pepper, green beans or spinach can go in during the last 5 minutes. For a richer sauce, use coconut cream instead of milk. For a lighter version, replace half the coconut milk with stock. The curry keeps in the fridge for up to 3 days, and the flavours deepen overnight. Reheat gently on the hob or in a microwave. It freezes well for up to 3 months, but add the crispy shallots fresh after reheating.

A Few Expert Tips

• Do not boil coconut milk hard – it can split. Keep it at a gentle simmer.
• If it does split, whisk in a tablespoon of cornflour mixed with a little water, or blend a cup of the sauce and return it to the pan.
• Butternut squash varies in sweetness. Taste and adjust the sugar accordingly.
• Check your curry paste. Many traditional brands contain shrimp paste, so look for a vegetarian version.
• For extra depth, add a teaspoon of fermented soy bean paste or white miso with the curry paste.
• Toast the curry paste in coconut cream, not oil, for a more authentic Thai flavour.
• Use a wide pan so the squash cooks evenly and the sauce reduces nicely.
• Add lime juice off the heat to keep its bright, fresh notes intact.

Once you have mastered this base, swap in any seasonal squash or pumpkin. The method stays the same. The crispy shallots make it special every time. So grab a squash, open a tin of coconut milk, and bring a little Southeast Asian warmth to your kitchen.