Frijoles Colados are pureed beans that are seasoned by being cooked and thickened a bit over sauteed onion. If you keep on cooking the Frijoles Colados about 15 minutes more, you get to to have a smooth version of the Refried Beans.
BASIC PUREED BEANS
Makes about 5 cups
1 portion of Frijoles de Olla or Beans from the Pot or 5 cups precooked beans and 2 cups of cooking liquid (including their liquid and enough water to make 2 cups)
In batches, place beans and their cooking liquid in the blender or food processor and puree until smooth.