Lamb and Date Brochettes with Tabbouleh Salad

Name: Lamb and Date Brochettes with Tabbouleh Salad
Ingredients: 2 tablespoons unsalted butter; 1 medium onion, cut into 1-inch dice; 30 pitted Medjool dates, halved crosswise (about 1 1/4 pounds); 2 3/4 pounds well-trimmed boneless leg of lamb, cut into 1-inch cubes; 1/2 cup olive oil; 1 tablespoon ground cumin; 2 teaspoons harissa (see Note); Salt and freshly ground pepper; 3 cups medium-coarse grade bulgur (1 pound); 1 1/2 cups fresh orange juice (from about 4 oranges); 3/4 cup fresh lemon juice (from about 4 lemons); 1/2 cup extra-virgin olive oil; 4 tomatoes, seeded and diced; 4 cucumbers, seeded and diced; 1 cup coarsely chopped mint