Measure the smoked salmon into a food processor and whiz for a few moments until roughly chopped. Add the remaining burger ingredients and a little salt and black pepper. Whiz again for a moment until the mixture has come together but still has texture. Shape into 8 burgers.

Heat 2 tablespoons of the oil in a large non-stick frying pan over a lowish heat, add the burgers and fry for 3–4 minutes on each side, until golden and cooked through.

Meanwhile, to make the lemon caper mayonnaise, mix all the ingredients together in a small bowl and season well.

Heat the remaining oil in a small pan over high heat and fry the fennel slices for about 5 minutes, until softened and golden.

Place half a lettuce leaf on each bun base and top with a burger, some crispy fennel, slices of dill cucumber and a spoonful of lemon and caper mayonnaise.

Mary’s tips:

Burger can be made up to a day ahead.

Freezes well raw.