Vegan black bean burgers

Name: Vegan black bean burgers
Cook time: 1 h
Total time: 1 h
Cuisine: American, Latin American
Ingredients: olive oil; black beans 400g tin, rinsed and drained well; cooked brown rice 100g from a pouch; onion 1, finely chopped or grated; fennel seeds 1 tsp, crushed; garlic salt ½ tsp; smoked paprika 1 tsp; panko breadcrumbs 25g; flat-leaf parsley finely chopped to make 1 tbsp; red wine vinegar 2 tbsp; golden caster sugar 2 tsp; red onion 1, finely sliced; silken tofu 100g; cider vinegar 1 tsp; lemon juice 1 tsp; English mustard powder a pinch; chipotle paste 1 tsp; avocado 1, peeled and stoned; red onion 1/2 small, finely chopped; red chilli 1/2, finely chopped; coriander chopped to make 1 tbsp; lime 1/2, juiced; vegan or regular buns 4, halved; curly lettuce leaves; beef tomato slices; ketchup; mustard