Heat sunflower oil in a saute pan over medium-low heat. Saute the onions and garlic until they begin to soften, about five minutes. Cool.
Add the onions to the lamb mince along with the breadcrumbs, cumin and herbs.
Add the egg and season well with salt and pepper.
Using your hands, mix everything together and shape into four burgers.
Brush each burger, and 1/4 inch slices of Halloumi cheese, with a little sunflower oil. Fry the burgers 8-10 minutes over medium-high heat until the juices run clear, and fry the Halloumi until browned.
Assemble your burgers with toasted burger buns or flatbreads, arranging the Halloumi cheese on the top and drizzling with some chilli-infused olive oil.