Step 1: Prep the Onions & Pickles

Thinly slice the white onion and submerge the slices in a bowl of cold water (this keeps them extra crisp and mellows the raw onion bite).

Drain the pickle slices thoroughly. (Pro-Tip: Keep the pickle juice in the fridge to use for brining chicken or pork chops!)

Step 2: Bread & Fry the Pickles

In a small mixing bowl, whisk together the egg and milk.

In a shallow baking dish, combine the flour and seasoned salt.

Dip each pickle slice into the egg wash, then coat directly in the flour mixture. Set flour-coated pickles on a paper-towel-lined baking sheet until all are prepped.

Heat vegetable oil in a skillet over medium-high heat. Fry the pickles in batches until golden brown and crispy. Transfer to paper towels to drain.

Step 3: Grill the Burgers & Buns

Cook the Wagyu beef patties on a hot grill until they reach your desired level of doneness.

Butter the brioche buns and toast them on the grill until lightly browned.

Step 4: Assemble & Serve

Spread a generous layer of yellow mustard on both the top and bottom toasted buns.

Drain the onions on paper towels and divide them evenly on the bottom buns.

Add the cooked Wagyu patties, a generous stack of hot fried pickles, and another drizzle of yellow mustard.

Top with the bun, secure with a toothpick (spear a fried pickle on top for garnish!), and enjoy immediately!