aka kafta, kofta, koefta. Served on crusty rolls or country-style bread and reportedly a popular snack in Bulgaria. Not to be confused with Arab kufteh which is grilled ground lamb kebabs or meatballs. Source: Steven Raichlen.
Combine all the ingredients in a bowl; stir to mix with a wooden spoon (test the mixture for seasoning by sauteing a teaspoon of it in a nonstick skillet until cooked through, then taste, adding salt, pepper, or cumin to the remaining mixture; should be highly seasoned).
Divide the meat into 4 equal parts; lightly wet your hands with cold water, then form each portion into a patty 3 inches across and about ¾ inches thick.
When ready to cook, oil the grill grate; arrange burgers on the hot grate and grill, turning with a spatula, until nicely browned on both sides and cooked through, about 4 minutes per side.