Slow Cooked Keralan Vegetable Curry

Name: Slow Cooked Keralan Vegetable Curry
Prep time: 10 min
Cook time: 6 h
Ingredients: Onion: 1 large; Garlic: 2 cloves; Aubergine: 1; Butternut Squash or Sweet Potato: 300g; Yellow Pepper: 1; Cauliflower: 1/3 head; Spinach: 2 handfuls; Dried Red Lentils: 150g; Chopped Tomatoes: 400g; Coconut Milk: 400ml; Fresh corriander: 1/2 a bunch; Garam Masala: 2 tbsp; Turmeric: 1 tsp; Ground Ginger: 1 tsp; Mild Chilli Powder: 1 tsp; Lime: juice of 1/2