1
Set 4 whole garlic cloves in a small skillet over medium-high heat and toast for 5 minutes. Cool until you can hold, then peel, mince and set aside.
2
Break up lamb in a medium bowl. Add roasted garlic, feta, oregano, salt and pepper over meat and stir until combined.
3
Make in to four patties and refrigerate.
4
Mix cucumber, sour cream, mint, vinegar, 1 minced clove of garlic, and salt and pepper to taste in a small bowl.
5
Refrigerate sauce until ready to serve.
6
Cook, turning only once, until done, about 4 to 5 minutes per side for medium to medium-well burgers.
7
Grill pitas until warm and split crosswise.
8
Spread a couple of tablespoons of sauce over 4 pita halves.
9
Top each with an onion slice, a tomato slice and a burger. Spread a portion of the remaining sauce over each burger and cover with pitas.