These double-stacked smash burgers are piled high with caramelized onions, jalapeños, and an
umami-loaded burger sauce.
Ingredients
Burger Sauce
3 tablespoons mayonnaise
1 1/2 tablespoons ketchup
1 teaspoon worcestershire sauce
1/2 teaspoon black pepper
1/4 teaspoon garlic powder
1/4 teaspoon kosher salt
Smash Burgers
1 1/2 pounds high-quality 80% lean ground beef
1 teaspoon canola oil
1 large yellow onion, very thinly sliced (about 2 cups)
1 large jalapeño chile, very thinly sliced (about 1/2 cup)
1 1/4 teaspoons kosher salt, divided
3/4 teaspoon black pepper, divided
4 American cheese slices
4 soft hamburger buns, split and toasted
Directions
Make the burger sauce
Step 1
Stir together all burger sauce ingredients in a small bowl. Cover, and chill until ready to use.
Make the smash burgers
Step 1
Divide beef into 8 (3-ounce) portions, and shape each portion into a loose ball; place on a plate. Cover, and
chill while preparing grill. Cut a 3-inch square of parchment paper; set aside. Preheat grill to high (450°F to
500°F); place a large cast-iron skillet or griddle on grill to preheat. (Alternatively, heat a flattop griddle to
medium-high, or a large cast-iron skillet or griddle on the stove over high.)
Step 2
Drizzle skillet evenly with oil. Working in batches if needed, arrange onion slices in 8 small mounds (about
1/4 cup each) on skillet, spacing at least 2 inches apart. Top onion mounds with jalapeño slices (about 1
tablespoon each), and sprinkle evenly with 1/2 teaspoon salt and 1/4 teaspoon pepper. Cook, undisturbed,
until onions are beginning to brown, 30 seconds to 1 minute.
Step 3
Place 1 meat ball on each onion mound.
Step 4
Top with parchment paper square, and press firmly to flatten, using a sturdy spatula or burger press, to form
a 4-inch-wide patty; remove parchment paper. Repeat process with remaining meat balls and onion
mounds. Sprinkle smashed patties evenly with remaining 3/4 teaspoon salt and remaining 1/2 teaspoon
pepper. Cook, undisturbed, until patties begin to crisp around the edges, 2 to 3 minutes.
Step 5
Flip patties so that onion-jalapeño mixture is on top. Place 1 cheese slice on each of 4 patties. Continue to
cook until patties are well browned and cheese is melted, 1 minute and 30 seconds to 2 minutes. Top each
cheese-covered patty with a plain patty to create 4 double stacks. Transfer each stack to a bottom bun.
Spread about 1 tablespoon burger sauce on each top bun; place on top of patties. Serve immediately.
