Brazilian Black Beans

This rare gem of a recipe is from southern Brazil. You will need to buy a pressure cooker, but it's worth the price.

2 tablespoons extra virgin olive oil
1 small yellow onion
2 cloves garlic, minced
2 teaspoons salt
1 lb. dry black beans
1 teaspoon dried oregano
2 packets Sazón without Annatto
1 tablespoon apple cider vinegar
1/4 teaspoon ground black pepper
1-2 beef bones

Place black beans in large pressure cooker; fill to a little more than half-way with water. Dice onions and add to cooker. Add all other ingredients, except bones. Place uncovered on high heat until boiling. Seal pressure cooker with lid; once the steam vent starts rocking, turn the stove down to medium-low heat. Cook everything but the bones for an hour. De-pressurize, then add bones and more water, if needed, and cook for another half-hour to hour. Remove and discard bones. Serve over rice. Feeds a small army.