Tuna & smashed avocado burgers

Finely chop the tuna steaks, then add to a mixing bowl with the salad onions, ginger, soy and a pinch of salt. Mix well with your hands, then shape into 2 patties about 1.5cm thick and set aside.

Roughly chop the avocado and tip into a bowl. Crush with a fork, stir in the coriander, lime juice, sesame oil and a pinch of salt, then set aside. In a small bowl, mix the wasabi and mayonnaise and set aside.

Put a medium frying pan over a high heat and toast the buns, cut-side down, for 30 seconds. Set aside. Add the vegetable oil to the pan and, once hot, fry the patties for 2-3 minutes each side until cooked and opaque throughout.

To build the burgers, spread the wasabi mayonnaise over the base of each bun. Top with the lettuce, tuna patties and smashed avocado, then serve immediately.