Jamaican-style vegetable stew

INGREDIENTS

• 1 small onion , peeled and roughly chopped
• 2 garlic cloves , crushed
• oil
• 1 scotch bonnet chilli, finely chopped
• ½ tsp ground allspice
• ½ tsp dried thyme
• 1 x 400g tin coconut milk
• 1 large sweet potato , peeled and chunked
• ¼ a small head cauliflower , broken into florets
• 100g spinach , chopped
• 4 spring onions , chopped to serve (include the green parts)