Frijoles Colados
from http://patismexicantable.com/

The Frijoles Colados or Strained Beans, are what the Yucatecans call Frijoles de Olla that have been pureed and then seasoned by being cooked in sauteed onion. They are cooked just for a couple minutes as they season. So it's like a gently seasoned and lightly thickened Bean Puree. They are like a dish made in between the plain Bean Puree and the Refried Beans. If you continue to cook the Frijoles Colados about 15 minutes more, you get to a consistency of a smooth version of Refried Beans.

Pureed beans are made with Frijoles de la Olla that are placed in a blender or food processor and pureed until smooth. They serve many purposes such as bases for soups and enfrijoladas. Frijoles Colados are pureed beans that are seasoned by being cooked and thickened a bit over sauteed onion.

1 portion of Frijoles de Olla (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)
1/2 white onion, chopped
3 tablespoons safflower or corn oil
Kosher or sea salt to taste

In batches, place beans and their cooking liquid in the blender or food processor and puree until smooth.

In a large saute pan over medium heat, pour the oil and heat until hot but not smoking, about 1 to 2 minutes.  Add the onions and let them saute for 3 to 4 minutes, until they have softened, become translucent, and have started to slightly brown along the edges.

Add a cupful of the bean puree at a time, over the sauteed onion, and let them season for 3 to 4 minutes.

Makes about 4 cups