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Heat 2 tbsp olive oil in a frying pan. Tip in the sliced onions and cumin seeds, plus seasoning. Cook gently for 20 mins until golden and caramelised.
Meanwhile, put the spinach in a colander and pour over a kettle or two of boiling water to wilt. Squeeze the spinach as dry as possible, chop roughly and put in a large bowl. Add the mince, grated onion, ricotta and seasoning. Mix thoroughly, then shape into 4 burgers. Heat 2 tsp of oil in a non-stick frying pan and cook the burgers for 8-9 mins each side, or until cooked through.
Mix the yogurt, mint and seasoning in a bowl. Spread a little onto each bun, add the tomatoes and burgers, and put the onions on top. Add an extra dollop of yogurt and serve.