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- Preheat the oven to 180 ̊C/160 ̊C fan/gas mark 4.
- Place the sweet potato on a rimmed baking tray, drizzle with one tablespoon of olive oil and season with salt and pepper. Roast for 15-20 minutes until cooked through.
- Remove and allow to cool. In the meantime, heat the remaining oil in a pan over a medium-high heat and cook the onion for 3-4 minutes. Add the garlic and cook for one minute longer.
- In a bowl, roughly mash the black beans with a fork. Add the onion and garlic, the roasted sweet potato and the cumin, egg, breadcrumbs and herbs. Mix well and shape into patties. Pan-fry, grill or bake the patties until golden-brown, then serve on toasted burger buns with mayonnaise, lettuce, cucumber, tomatoes and red onion, with potato wedges or chips on the side.
Note: Potato chips can be used as an alternative to Potato wedges, if you wish.
Per Serving: 422kcals, 10.7g fat (1.7g saturated), 71.8g carbs (11g sugars), 14.9g protein, 11.5g fibre, 0.592g sodium