Combine black beans, salsa, and rice in a sauce pan and simmer gently for 3 minutes, stirring occasionally. Remove from heat, cover, and let sit for 5 minutes

In an ungreased skillet, heat a tortilla until warm and soft, then spread a line of the bean mixture down the center. Top with lettuce, tomato, and more salsa, if desired. Roll the tortilla around the filling, then repeat with the remaining tortillas.