Prep all the vegetables and put them in the slow cooker.
1 red onion, 1 sweet potato, 200 g butternut squash, 2 carrots, 1 red pepper
Add the rest of the ingredients and stir.
1 tin chopped tomatoes, 2 tbsp tomato purée, 1 vegetable stock cube, 500 ml water, 150 g red lentils, 1 tsp Italian herbs, 1 tsp dried basil
Cook for 4 hours on high or 6-7 hours on low.
Check the lentils haven't absorbed too much water during cooking. if they have, add a little water to loosen the sauce.
If you need to thicken the sauce (you shouldn't need to but all slow cookers differ and the red lentils may not absorb the same amount of liquid) you can either turn to high and leave the lid off for the last hour, or use cornflour made up as per instructions on pack if required.
Serve with pasta or rice, with some cheese grated on the top, and a green vegetable such as broccoli.
Freeze any extra in portions.