Add red onion, rosemary and cumin to lamb and mix well to combine - I use my hands.
Divide lamb mixture into 4, and form into patties.
Wrap 2 half slices of bacon around each patty.
Meanwhile heat oil in a large fry pan over medium heat.
Fry the patties for 2- 3 mins each side, or until cooked through. In about the last 4 minutes add the haloumi slices to the pan and fry, turning after about 2 mins.
Meanwhile combine the yoghurt, garlic powder and lemon zest and mix to combine.
Split open the bread rolls and lightly toast the cut sides.
Stack your burgers with a lamb patty, haloumi slices, tomato and rocket and drizzle liberally with yoghurt dressing.