Vegetarian chilli

INGREDIENTS

• 2 medium-sized sweet potatoes, approximately 500g
• 1 level teaspoon cayenne pepper, plus extra for sprinkling
• 1 heaped teaspoon ground cumin, plus extra for sprinkling
• 1 level teaspoon ground cinnamon, plus extra for sprinkling
• olive oil
• sea salt
• freshly ground black pepper
• 1 onion
• 1 red pepper
• 1 yellow pepper
• 1 bunch fresh coriander
• 1 red chilli
• 1 green chilli
• 2 cloves garlic
• 2 x 400 g tinned beans, such as kidney, chickpea, pinto and cannellini
• 2 x 400 g tinned chopped tomatoes