2 ears of corn, husked or 1 cup frozen corn, thawed
2 mangos, peeled, pitted and diced
2 tablespoons chopped fresh cilantro
4 green onions, thinly sliced
1 medium red bell pepper, seeded and chopped
3 cups cooked black beans or 2 (15 ounce) cans no-or-low salt black beans drained and rinsed
3 tablespoons fresh lime juice
1 teaspoon minced fresh garlic
1 teaspoon dried oregano
1 teaspoon ground cumin
dash chili powder
9 cups chopped romaine lettuce