Pre-heat oven to 180°C (350°F,Gas Mark 4) and line a baking tray with baking paper.
Drain the liquid from the black beans, wash and place them into a food processor/blender and whizz up until paste like.
Place the pepper, onion, garlic cloves, salt and pepper and garlic granules into a food processor/blender and blend until combined, then transfer the mixture into a large mixing bowl and combine.
Add in the black bean mixture and breadcrumbs. Mix until fully combined.
Form the mixture into burgers and place onto the lined baking tray. Bake for 10 minutes on each side until fully cooked. Whilst the burgers cook, prepare the avocado burger buns.
Slice an avocado in half and twist.
Carefully cut around the stone and remove.
Peel the skin from the avocados and place them on a plate. Cut a flat base so the avocados can stand.
Drizzle over some lime to keep the avocados fresh.
Once the burgers are cooked, carefully remove them from the oven and place onto the avocados, along with some fresh salad, tomatoes and tomato salsa.
Serve whilst warm, or you can freeze the burgers to enjoy at a later date.
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