A perfect cube is not essential, but try to get the lab into roughly the same size pieces so they cook at the same rate.
- 1 garlic clove, grated
- 1/2 tsp finely grated lemon zest
- 1 tbsp fresh lemon juice
- 1 cup plain Greek yogurt
- Kosher salt, freshly ground pepper
Lamb and Assembly
- 2 tbsp Sichuan peppercorns or 1 tsp black peppercorns
- 2 tsp caraway seeds
- 2 tsp crushed red pepper flakes
- 1 tsp sugar
- Vegetable oil (for grill)
- 1.25 lbs boneless lamb shoulder, cut into 1-inch pieces or Lamb Kabob Meat
- Kosher salt, freshly cracked pepper
- Finely grated lemon zest (for serving)
- A spice mill or a mortar and pestle; eight 8-12 in. long metal skewers
Stir garlic, lemon zest, and lemon juice into yogurt in a small bowl to combine; season with salt and pepper.
Do Ahead: Yogurt can be made 3 days ahead. Cover and chill.
Lamb and Assembly
Coarsely grind cumin seeds, peppercorns, caraway seeds, red pepper flakes, and sugar in spice mill or with mortar and pestle until only a few while spices remain.
Prepare a grill for medium-high, indirect heat (for a charcoal grill, bank coals on one side of the grill; for a gas grill, leave one or two burners off). Oil grates. Thread lamb onto 6-8 skewers, leaving a small gap between each piece of meat. Season with salt, then sprinkle generously with spice blend, pressing it onto the meat with your hands to help it adhere if needed.
Grill lamb over direct heat, turning every minute or so, until browned and beginning to char in spots, about 4 minutes. Move to cooler side of grill and continue to grill until lamb is cooked to desired doneness, about 4 minutes longer for medium-rare.
Top garlic yogurt with cracked black pepper and a little lemon zest. Serve alongside lamb.
Do Ahead: Spice blend can be made 1 month ahead. Store airtight at room temperature.