Heat oven to 200C/180C fan/gas 6.
Mix together the garlic, anchovy, lemon
juice, two-thirds of the Parmesan and
parsley. Put half in a small bowl, mix with
the yogurt and set aside. Mix the other
half in a large bowl with the mince and
onion, then season. Shape into 4 burgers
and place on a roasting tray, then cook
for 15-20 mins, until cooked through.
Meanwhile, mix the lettuce with the
yogurt dressing and slice the buns. To
assemble, place the burgers in the buns
with some salad and a few tomato slices.
Serve the burgers with any leftover salad
sprinkled with the reserved Parmesan.