Grilled Lamb Skewers with Couscous Tabbouleh

Name: Grilled Lamb Skewers with Couscous Tabbouleh
Ingredients: 1 10 oz. box couscous (4 cups cooked); 1 1/2 c. plain low-fat yogurt; 1 tbsp. plus 1 tsp. cumin; 2 garlic cloves, minced; Juice of 2 lemons; Sea salt; Freshly ground pepper; 1 1/2 lb. leg of lamb, cut into 1 1/2 in. chunks; 2 tomatoes, seeded and diced (1 1/3 c.); 1/2 English cucumber, halved, seeded, and diced (1 c.); 1/2 small red onion, finely chopped (1/3 c.); 1/4 c. finely chopped parsley; 1/4 c. finely chopped mint; 3 tbsp. extra-virgin olive oil; Lemon wedges, for serving