In a large saucepan or casserole dish, heat the oil and add the onion, leek, pepper, coriander stalks, garlic, chilli and spices. Fry gently for 4-5 minutes, adding a little water if the mixture becomes too dry.

Add the tomatoes, then refill the empty tin with water, tip this into the pan, re-fill it again to half-way and add this too. Tip in the borlotti beans, lentils, stock cube and marmite, then bring to the boil.

Turn down to a low heat, cover and cook for 1.5 - 2 hours until the lentils are tender and sauce has thickened. You may need to remove the lid for 10-15 minutes if there is too much liquid, or else add a little water if it is too thick/dry. Taste and season with salt and black pepper.

Stir through the coriander leaves just before serving - perhaps with rice, tortilla wraps, guacamole or fresh avocado, a squeeze of lime juice, finely chopped spring onions, or a dollop of soya or coconut yoghurt.