Prime Rib Gravy

1 . Stage

Gather ingredients. Preheat an oven to 450 degrees F (230 degrees C). Line a baking sheet with foil.

2 . Stage

Spread out onions, carrots, and celery on the prepared baking sheet. Set rib bones on top.

3 . Stage

Roast until bones are deep brown and onions are black, about 1 hour. Use a spatula or tongues to transfer bones and vegetables into a saucepan. Drain off and reserve any rendered fat from the baking sheet for the gravy.

4 . Stage

Add broth and water to the saucepan, and bring to a boil on high heat. Reduce heat to low and simmer until meat falls off bone and is flavorless, about 4 hours. Skim any fat from the surface and reserve.

5 . Stage

Strain broth and let cool to room temp.

6 . Stage

Melt butter in a pot on medium-high and sauté mushrooms until well browned. Add 2 tablespoons rendered beef fat and stir until melted. Add flour and cook for a few minutes.

7 . Stage

Whisk in broth, and bring to a simmer. Cook, stirring occasionally, about 5 minutes. Reduce heat to medium and simmer until gravy has thickened to desired thickness, 5 to 10 minutes more

8 . Stage

Adjust salt to taste and season with freshly ground black pepper, cayenne, and balsamic vinegar. Taste again, adjust, and serve. Chef John