Ingredients
Scale
- 5 pounds burger meat blend (80/20 meat to fat blend, equal parts dry aged short rib or brisket, chuck and sirloin)
- 5 pounds mushroom mix, ground (not chopped) – see instructions below
- 1 tablespoon kosher salt
- 1 tablespoon black pepper, fresh cracked
- ½ tablespoon canola oil
- 10 brioche burger buns
- 2 tablespoon bone marrow fat, softened
- 2 tablespoon butter, softened
- 2 sprigs rosemary
- 2 cloves garlic
- 20 each slices American cheese
- 4 yellow onions, sliced
- 2 cups mayonnaise
- 4 cups mustard
- 2 cups ketchup
- 1 cup bread & butter pickles – see instructions below for homemade
Instructions
- Fold bone marrow fat into butter and set aside.
- In a mixing bowl, mix ground beef and ground mushrooms, form in patties.
- In a separate mixing bowl, mix sliced yellow onions and yellow mustard, once evenly covered, cryovac onions and sous vide for 45 minutes at 88.6 C.
- Remove onions from bag and strain off any excess liquid.
- Heat a medium frying pan over medium high heat and place onions and 1 tbsp canola oil and 1 tsp black pepper into pan.
- Cook onions, stirring occasionally for 3 minutes, until onions are softened throughout.
- Place burgers on a flat baking sheet and season liberally with kosher salt and black pepper on both sides.
- Heat a griddle over medium high heat and place burgers on hot griddle, giving light press on the top of the burger just enough to ensure the surface is touching the griddle.
- Bone marrow the inside of burger buns and place on griddle.
- Using the palm of your hand or side of your knife, smash 2 garlic cloves.
- Add smashed garlic and rosemary to griddle in between the burger patties and let cook for 2 minutes.
- Once burgers are browned on the bottom side, flip burger patties and top with American cheese. Remove from griddle and place on baking sheet to rest.
- Place burger buns back on griddle for 30 seconds, to soak up all the cooking juices and flavor the buns.
- Spread ketchup, mustard and mayonnaise on top of buns.
- Layer cooked onions on ketchup.
- Place cooked burger patties on top of onions and finish with bread and butter pickles and the top bun.
- Serve