Burgers Fumés aux Haricots Noirs

• 2 tbsp olive oil, divided
• 1 red onion, finely chopped
• 150g mushrooms, finely chopped
• 2 garlic cloves, crushed
• 1 roasted red pepper from a jar, chopped
• 2 × 400g tins black beans, drained and patted dry
• 80g rolled oats, blitzed to a coarse flour
• 2 tbsp ground flaxseed mixed with 5 tbsp water
• 1½ tsp smoked paprika
• 1 tsp ground cumin
• 1 tbsp soy sauce
• 1 tbsp tomato purée
• To taste salt and pepper
• 6 burger buns, toasted
• To serve sliced tomato, red onion rings, lettuce, vegan mayo or ketchup

Nutrition