Sweet potato burger with cumin spiced onion rings

Ingredients

• 2 cups cooked baked sweet potato pieces (about 800g raw)
• 1 cup (120g) breadcrumbs
• 1 free range egg
• 1/2 (60g) brown onion, peeled and roughly chopped
• 2 teaspoons ground cumin
• 1 teaspoon ground paprika
• 1/2 teaspoon dried oregano
• 2 tablespoons extra virgin olive oil
• 1 cup (200g) cooked black beans
• 2 (300g) brown onions, peeled and sliced into 1cm thick rings
• 2 free range eggs
• 1 1/2 tablespoons ground cumin
• 1 1/2 cups almond meal
• 1/2 cup coconut yoghurt
• 1/2 teaspoons ground turmeric
• 2 teaspoons curry powder
• 1/4 (150g) small red cabbage, finely sliced
• 2 tablespoons chopped fresh coriander
• 1 tablespoon extra virgin olive oil
• 1 tablespoon lemon juice
• 4 burger buns of choice or 12 ice berg lettuce leaves to serve
• sea salt
• black pepper