Ingredients
3/4 cup buttermilk
3 garlic cloves, crushed with a press
1/2 cup fresh dill, chopped
Salt and pepper
1 1/2 pounds top round leg of lamb, cut into 1 1/2-inch pieces
Oil for grill
2 large zucchini, cut into 1 1/2-inch pieces
2 large summer squash, cut into 1 1/2-inch pieces
Preparation
Combine buttermilk, garlic, dill, and 1 teaspoon salt and 1/2 teaspoon pepper. Set aside 1/4 cup of marinade. Reserve and refrigerate about 1/4 cup of marinade. Transfer remaining marinade to a zip-top bag and add lamb and toss to coat. Refrigerate 8 hours (or up to overnight).
Heat a grill or grill pan to medium-high. Clean and lightly oil hot grill. Thread some skewers with lamb, others with zucchini, and others with summer squash. Season with salt and pepper. Grill lamb skewers for 9 to 12 minutes and zucchini and squash skewers for 12 to 15 minutes, turning all skewers frequently and brushing with reserved marinade.