Charred Buffalo Medallions with Coffee BBQ Sauce

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1 tablespoon olive oil

1 tablespoon unsalted butter

1 1/12 pounds tenderloin of buffalo (American Bison), cut into 1-inch-thick medallions

Salt and pepper to taste

1 small Vidalia onion, cut into a medium dice

1/4 cup gold tequila

1/4 cup lime juice

1 cup rich beef or veal stock

1/2 cup Black Coffee Barbecue Sauce, recipe follows

1/2 teaspoon salt

1/2 teaspoon ground black pepper

Black Coffee Barbecue Sauce:

1/2 cup very strong black coffee, espresso preferred

1 cup ketchup

1/2 cup red wine vinegar

1/2 cup firmly packed dark brown sugar

1 onion, peeled and chopped, about 1 cup

2 cloves garlic, peeled and crushed

2 tablespoons dark molasses

3 fresh hot chili peppers, such as jalapeno, or hotter if desired, seeded (about 2 ounces or 4 to 5 tablespoons)

2 tablespoons hot dry mustard mixed with 1 tablespoon water

2 tablespoons Worcestershire sauce

2 tablespoons ground cumin seed

2 tablespoons ancho chili powder