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Method

1. To make the suya spice, put all the ingredients in a jam jar, seal and shake.

2. For the 鈥榮uyannaise鈥�, put the egg yolk into a medium bowl and whisk with the suya spice and lemon juice until pale. Add a little oil, whisk again. Whisk continuously adding the remaining oil gradually in a thin stream until the mayonnaise is very thick.

3. Once all the oil is combined, add the boiling water and whisk until the mayonnaise has a soft, dropping consistency. (You can also make the mayonnaise in a small food processor.) Transfer to a small bowl, cover the surface with cling film and store in the fridge.

4. For the watermelon salad, mix the melon, cucumber, feta and parsley in a bowl and top with toasted nigella seeds. Set aside.

5. For the sweet potato cubes, cut the sweet potato into 2cm/戮in cubes. Half-fill a medium saucepan with water and bring to the boil. Add the sweet potato and cook for 5陆 minutes, then drain in a sieve and leave to stand to cool and dry.

6. For the caramelised onions, save a few of the larger onion rings to serve raw inside the burger. Heat a tablespoon of the oil in a small non-stick saucepan over a low heat and gently fry the remaining onion for 6鈥�8 minutes or until very soft and lightly browned, stirring regularly. Add the sugar and cook for a few seconds more, stirring. Set aside.

7. Preheat a deep-fat fryer to 180C. (CAUTION: hot oil can be dangerous. Do not leave unattended.)

8. For the burger, place the steaks on a board and cover with a sheet of cling film. Bash with a rolling pin or the base of a heavy saucepan until around 15mm/鈪漣n thick, then season with the pepper.

9. Heat the remaining tablespoon of oil in a medium non-stick frying pan and fry the steaks for 1陆 minutes on each side, over a high heat or until cooked to your liking. Set aside to rest for 5 minutes.

10. Add the sweet potato cubes to the fryer and cook for about 4 minutes or until golden-brown. Drain on kitchen paper.

11. Meanwhile, lightly toast the bread buns. Divide the bun bases between two plates. Top each one with a tablespoon of suyannaise, lettuce, slices of tomato and the reserved sliced red onion.

12. Sprinkle the rested steaks in suya spice and crumble the cheese on top. Melt with a blowtorch or place on a baking tray under a preheated hot grill until melted. Place in the bun and top with caramelised onions.

13. Serve the burgers with the watermelon salad and hot sweet potato cubes on the side.