To prep the iceberg lettuce cups, remove the core, rinse the head with cold water, and shake off the excess water. Cut in half and separate the leaves. Pat the leaves dry with paper towels and hold for assembly. On the burner side of a grill, heat a large sauté pan over medium high heat. Brown the ground turkey and season with Mrs. Dash® Garlic & Herb Seasoning Blend. Remove the turkey from the pan and hold for assembly. Place the pan back on the burner and heat the olive oil. Add the red pepper and onions and sauté for 2 minutes. Add the cooked ground turkey back to the pan along with the black beans, corn and tomato sauce and cook for another 2 minutes. Keep warm for service. In the middle of a lettuce cup, place a scoop of the turkey mixture and top with sour cream and a sprinkle of chopped cilantro (optional). Do not over fill the lettuce cup.