Wolfgang Puck'S Cheeseburger Sliders

• 1/2 cup mayonnaise
• 1 tablespoon finely chopped red onion
• 1 tablespoon ketchup
• 1 tablespoon sherry vinegar
• 1 teaspoon capers, drained and chopped
• 1 teaspoon chopped fresh flat-leaf parsley
• 1/2 teaspoon chopped fresh thyme
• 1/8 teaspoon white sugar
• 1 pound 85% lean ground beef
• 1 1/2 teaspoons kosher salt
• 1 teaspoon ground black pepper
• 4 tablespoons extra-virgin olive oil
• 3 small slices (0.5 oz) Cheddar cheese, quartered
• 12 mini brioche buns, split
• 1 small head iceberg lettuce, shredded
• 6 cherry tomatoes, sliced
• 3 cornichons (tart pickled gherkin cucumbers), sliced

1. Preheat a grill or grill pan to medium-high (400 to 450 degrees F (200 to 230 degrees C)).
2. Stir together mayonnaise, red onion, ketchup, vinegar, capers, parsley, thyme, and sugar in a small bowl until combined.
3. Place beef in a large bowl. Add 3/4 teaspoon salt and 1/2 teaspoon pepper. Mix by hand until just combined. Make 12 meatballs by rolling beef mixture between your palms; transfer to a baking sheet. Flatten tops slightly. Drizzle with oil and season both sides with remaining 3/4 teaspoon salt and 1/2 teaspoon pepper.
4. Arrange patties on oiled grates; grill, uncovered, for 3 minutes. Flip, then top each with 1 piece cheese. Grill, uncovered, until cheese is melted and beef is cooked through, about 2 minutes. Meanwhile, put buns, cut-sides down, on grate; grill until toasted, about 1 minute.
5. Top bun bottoms with a small spoonful of sauce. Add a patty, shredded lettuce, tomato slices, cornichon slices, and bun tops.

mayonnaise, red onion, ketchup, sherry vinegar, capers, parsley, thyme, white sugar, ground beef, kosher salt, ground black pepper, extravirgin olive oil, cheddar cheese, buns, head iceberg lettuce, tomatoes, cornichons

Taken from www.allrecipes.com/recipe/269896/wolfgang-pucks-cheeseburger-sliders/ (may not work)