Heat up grill or grill pan. To make the lamb patties, add 1 lb lamb, 1 heaping teaspoon each cumin and coriander, 1 teaspoon salt, ½ teaspoon ground pepper, ¼ cup bread crumbs, & 1 tablespoon minced shallot to a large mixing bowl. (note: if using extra lean ground lamb, add ½ tablespoon oil to mixture). Mix everything together well until combined. Divide into 4 portions for 4 oz patties or 6 for 3 oz patties. Form patties, making them slightly bigger than bun size.
Place each patty onto grill or grill pan. Cook first side for 4 minutes, flip patty and cook for 4-6 minutes on second side, or until internal temperature reaches 155 degrees and let it rest for a few minutes before serving.
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While patties are cooking, prepare tzatziki sauce. Pour ½ cup plain yogurt into small mixing bowl. Add 1 tablespoon finely chopped mint leaves, 1 teaspoon lemon juice, & ½ teaspoon garlic salt to yogurt. Mix together. Refrigerate until serving.
Assemble burgers by layering cucumbers, tomato, a lamb patty, and 1-2 tablespoon tzatziki sauce on hamburger buns. Include other toppings if desired.