Fibre feast smoky bean & sweet potato burgers

Ingredients

• 130g sweet potato, chopped with skin on
• 1 x 400g tin of mixed beans, drained and rinsed
• 60g carrot, grated
• 1 large egg
• 1 tsp cumin
• 1 tsp garlic powder
• 10g fresh coriander, chopped
• 1 tsp smoked paprika
• 1 tsp chilli (fresh or flakes), optional
• 1 tbsp soy sauce
• a twist of black pepper
• 40g rolled oats
• 1 tbsp wholemeal flour
• 1 red onion, thinly sliced
• 1 lemon, juiced
• ½ tsp sea salt
• Wholegrain burger buns
• Mixed leaves
• Kefir yoghurt
• Sliced tomato
• Sliced pickles