Black Bean Burger

Ingredients

• 2 ripe plantains
• 400g tin black beans, drained and rinsed
• 1 tsp sea salt flakes
• 1 tsp freshly ground black pepper
• 1 Scotch bonnet or other chilli, seeds removed, chopped
• 1 tsp dried mixed herbs
• 2 tbsp finely chopped fresh coriander
• 1 red onion, finely chopped
• 250g plain flour
• 2 tbsp olive oil
• To serve
• iceberg lettuce, shredded
• 4 vegan burger buns, split
• 1 large tomato, thickly sliced
• 1 avocado, sliced
• sweet chilli sauce