Peel and take out the seeds of 1 butternut squash, cut in smaller pieces.
Peel 2 carrots and cut into smaller pieces, about the same size as the butternut squash.
Add 1 tbsp oil to a Dutch oven or another thick bottom pan.
Add butternut squash and carrots to the pan. Let cook for five minutes, stir every so often to make sure it does not stick to the bottom.
Peel 1 red onion, cut in half then slice thinly.
Add red onion and 200 ml red lentils to the pot and stir.
Add 1 tbsp tomato pure, 1 tbsp red curry paste and 1/2 tsp salt. Stir to cover all vegetables with the seasoning.
Add 200 ml water and 400 ml coconut milk to the pot. Stir for the liquid to cover most of the vegetables.
Bring to a boil, before lowering the heat to a simmer.
Let simmer for up to 20 minutes. Stir occasionally and check on your vegetables for softness.
Prepare your couscous according to instructions on the package.
When vegetables are soft, taste and add more salt, tomato pure or red curry paste as needed.
Serve the curry over couscous.