Salsa Madre (Black Bean Puree)

1 pound dried black beans, rinsed
Water
3 bay leaves
1 teaspoon fennel seeds
1/2 white onion, with peels and roots
1/2 head garlic, with peels and roots
1/4 cup plus 1 tablespoon kosher salt

Combine the black beans with quarts of water in a Dutch oven or heavy stockpot over high heat.  Add the bay leaves, fennel seeds, onion, and garlic.  Bring to a boil, then lower to a simmer and cook, uncovered, until the beans are very tender, 2 to 3 hours.

While the beans are cooking, make the salt brine: combine 1 quart water with the salt and whisk until the salt is completely dissolved.

When the beans are tender, remove from the heat.  Pour them through a fine-mesh strainer, reserving all the cooking liquid and aromatics.  Add the beans to the brine and let them sit for at least 1 hour.

Drain the beans thoroughly, discarding the brine, and combine them in a blender with 1 cup of the cooking liquid and the bay leaves, fennel seeds, onion, and garlic from the pot.  Puree until smooth.  Add a little more cooking liquid if needed but only enough to help the blades turn.

The puree can be refrigerated in an airtight container for up to 1 week, or frozen for up to 6 months.

Makes about 5 cups.

From Cool Beans by Joe Yonan

Note: Sandeep likes this better with cumin and coriander added.  Brown ground cumin and coriander in a bit of oil for a few minutes, then add some of the salsa madre and stir for a few more minutes.