Chipotle, mushroom and black bean burgers recipe

Ingredients

• 50 g smooth peanut butter
• 1 x 400g/14oz tin of black beans, drained, but not rinsed
• 2 small cloves of garlic, peeled
• 2 tsp chipotle chilli flakes
• 1 tsp ground cumin
• 1 tbsp olive oil
• 1 tbsp (heaped) rye flour
• 1 lime, zest only
• 1 tsp sea salt flakes
• 250 g chestnut mushrooms
• 1 lime, cut into 4 wedges
• 1 handful chopped salted peanuts
• 1 handful chopped fresh coriander (cilantro)
• 4 burger buns