1For the Spicy Tomato Sauce, place all ingredients except vegetable oil in blender container. Cover. Blend on high speed until completely smooth. Heat oil in medium saucepan on medium heat until shimmering. Carefully add tomato sauce mixture; bring to simmer. Reduce heat; simmer until slightly thickened, about 5 minutes.
2To assemble Tortas, spread refried beans on bottom half of split roll. Divide carnitas and pickled onions evenly among rolls. Replace top half of roll. Place Tortas on serving plates; ladle Spicy Tomato Sauce over top until completely covered. Serve with lime wedges.