Prep time: 24 hours 75 minutes
For the potato buns: (Yields 22 buns)
1 cup cooked russet potato puree
3/4 cup whole milk
1/3 cup unsalted butter
3 tablespoons kosher salt
3 tablespoons granulated sugar
3 tablespoons nonfat dry milk
3 tablespoons potato flour
2 cups all-purpose flour
1/2 cup bread flour
2 teaspoons instant yeast
8 tablespoons unsalted butter, to brush
For the pickle:
2 cups distilled white vinegar
1/2 small yellow onion, thinly sliced
3 garlic cloves, crushed and peeled
2 whole cloves
1 star anise pod
1/2 teaspoon coriander seeds
1/2 teaspoon caraway seeds
kosher salt, to taste (a lot)
1 English cucumber, sliced 1/4 inch thick
4 dill sprigs
For the beef patty:
2 pounds ground beef (I use a mix of 3-week-aged chuck and sirloin, mixed with fresh chuck, short rib trim, and brisket.)
For the onion:
3 yellow onions, small dice
For the bone marrow:
10 cross cut sections of beef marrow bones
For the breadcrumbs:
For the cheddar mayo:
2 large egg yolks
1 1/2 tablespoons apple cider vinegar
1 cup vegetable oil
1/2 cup finely grated aged white cheddar, such as Cabot Clothbound
1 teaspoon hot Chinese mustard powder (mixed with water)
1. First, brine bone marrow overnight in diluted red wine vinegar and salt, then roast them until just cooked. Once cooled, remove the marrow and cut it into coins. Reserve fat and marrow.
2. Make your buns. Combine the ingredients in a mixer. Use a dough hook to knead for 5 to 8 minutes until smooth. Transfer the dough to a greased bowl, cover, and allow the dough to rise in a warm place for 1 to 2 hours.
3. Once risen, punch down and divide into 2 ounce portions, shape and place on a greased baking sheet or a Silpat lined sheet—roughly an inch apart. Allow to rise until doubled in size.
4. Once risen, brush with melted butter and bake at 375° F for 12-15 minutes.
5. Next, make the pickles. In a medium saucepan, combine the white vinegar, yellow onion, garlic, whole cloves, star anise, coriander and caraway seeds and 2 1/2 tablespoons of salt and bring just to a boil, stirring to dissolve the salt.
6. Allow brine to sit for 5 minutes. Pour over the cucumber slices and dill and let cool completely. Transfer the cucumbers and brine to a jar and refrigerate for at least 1 hour or up to 3 days.
7. Next, make the beef patties. I used a combo of 3 week-aged chuck and sirloin mixed with fresh chuck, short rib trim, and brisket. It was ground once using a medium sized die. Formed into 1.5 ounce square patties.
8. Dice the onions into a small dice. Fry the crumbs in bone marrow fat until crispy and season with salt.
9. Now, make the cheddar mayo: In a blender or mini food processor, combine the egg yolks with the cider vinegar and mustard powder and puree until smooth. With the machine on, add the oil a few drops at a time until the mayonnaise starts to thicken, then add the remaining oil in a very thin stream until the sauce is emulsified. Add the cheese and puree until smooth. Season the mayonnaise with salt and pepper and scrape into a bowl. Refrigerate until chilled, about 30 minutes.
10. Finally, it's time to cook the beef. Season the beef patties with salt. Heat a cast-iron skillet or griddle.
11. Fry small patty sized piles of white onion. Once they begin to steam, top with a beef patty. Steam until cooked to your liking.
12. Place onions and patty on a warm bun, top with pickle, crumbs, marrow coin and the top of the bun. Dip in hot mustard (optional) and cheddar mayonnaise. Eat.