Place the kidney beans and black beans into a food processor and pulse a few times until you have a lumpy paste (I like it with a bit of texture).
400 g (14 oz) tin kidney beans, 400 g (14 oz) tin black beans
Transfer the mixture to a bowl and add the tomato puree, gram flour, Cajun spice, garlic powder, onion powder, salt, pepper, grated cheese and two tablespoon of the drained liquid from the Kidney beans (or use water if you forgot to save it). Stir with a spoon until combined.
20 g (1/4 cup) gram flour, 1 tbsp cajun spice, ½ tsp garlic powder, 1/2 tsp onion powder, 1/2 tsp salt, 1/2 tsp black pepper, 150 g (1 1/3 cups) grated mature cheddar cheese, 1 tbsp tomato puree
Place flour, beaten egg, and breadcrumbs in three separate shallow bowls.
60 g (1/2 cup) plain (all-purpose) flour, 2 eggs, 100 g (2 cups) fine golden breadcrumbs
Split the bean mixture into four portions and shape into four patties. Coat each pattie first in the flour, then the egg (make sure it's fully covered), then in the breadcrumbs.
Heat the oil in a large frying pan or skillet over a medium-high heat and fry the burgers for 3-4 minutes each side) until golden and crispy.
240 ml (1 cup) oil for frying
Assemble the burgers by placing the burgers on the base, followed by the burger cheese, ketchup, sliced tomato, lettuce and mayonnaise. Add the top half of the bun and serve.
Can I oven-bake or air fry instead?They are a bit drier when baking or air frying, but yes, you can if you prefer. Brush/spray the burgers with oil then air-fry for 10-12 minutes at 200C/400F, until golden and cooked through. Alternatively oven-bake on a tray at 200C/400F (fan) for 15-20 minutes until golden and cooked through.
Can I make ahead?Yes, make up the burgers (but don't cook) then refrigerate or freeze in an airtight container with a piece of parchment paper between each burger to prevent them sticking together. Fry straight from the fridge - adding an extra minute to the cooking time. Or fry straight from the freezer - adding an extra 2-3 minutes to the cooking time. Check they're piping hot throughout before serving.
Storing/Reheating leftoversQuickly cool the cooked burgers, then refrigerate or freeze in an airtight container with a piece of parchment paper between each burger to prevent them sticking together. Reheat straight from the fridge, uncovered, in a single layer, on a baking tray, in the oven at 180C/350F (fan) for 15-20 minutes, until piping hot throughout. Or reheat the straight from the freezer, uncovered, in a single layer, on a baking tray, in the oven at 180C/350F (fan) for 22-24 minutes, until piping hot throughout.
Nutritional Information is approximate, per veggie burger - NOT including bun, cheese slices and sauces.
Adding 1 brioche bun, 1 slice of burger cheese, 1 tablespoon of ketchup and 1 tablespoons of full-fat mayo for each burger will add approx 300 calories per burger. Which is a hefty calorie amount, but it's a filling burger.
*Note* I've calculated for 1 tablespoon of oil, being absorbed into each burger during the frying process. This may vary for you.