Sweet potato & coconut curry

Name: Sweet potato & coconut curry
Prep time: 20 min
Cook time: 8 h 30 min
Total time: 8 h 50 min
Cuisine: Asian
Ingredients: 4 tbsp olive oil; 2 large onions, halved and sliced; 3 garlic cloves, crushed; thumb-sized piece root ginger, peeled; 1 tsp paprika; ½ tsp cayenne; 2 red chillies, deseeded and sliced; 2 red peppers, deseeded and sliced; 250g red cabbage, shredded; 1kg sweet potatoes, peeled and chopped into chunks; 300g passata; 400ml coconut milk; 2 tbsp peanut butter; small bunch fresh coriander, chopped; cooked couscous (or gluten-free alternative)