Mexican Chicken Tortillas - With legumes

15 ounces cooked black turtle beans 2 tablespoons olive oil 1 lb boneless skinless chicken thighs , sliced into strips 1 yellow onion , peeled and chopped 2[...]

4 corn tortillas 6 cups iceberg lettuce , fine chopped (1 1/2 cups per person) 1 lb chicken , cut in thin strips 1 (15 ounce) can black beans , drained and[...]