INGREDIENTS:

Burger Sauce: 

• 1/4 c. mayonnaise
• 2 Tbsp. ketchup
• 1 Tbsp. sweet pickle relish
• 1 Tbsp. yellow mustard 
• 1 tsp. hot sauce

Smash Burger Tacos:

• 1 lb. ground beef 
• 6  (5") flour tortillas 
• 2 tsp. store-bought or homemade burger seasoning
• Kosher salt
• 6 Tbsp. neutral oil, divided 
• 6 slices American cheese, divided 
• 18 thin bread-and-butter pickle slices 
• 1 c. shredded iceberg lettuce
• 3 Tbsp. chopped yellow onion 
• White sesame seeds, for serving

INSTRUCTIONS:

Burger Sauce:

1. In a small bowl, mix mayonnaise, ketchup, relish, mustard, and hot sauce until combined. 

    2. Make Ahead: Sauce can be made 3 days ahead. Cover bowl and refrigerate.

Smash Burger Tacos:

1. Divide beef into 6 portions about 2 1/2 ounces each. Top each tortilla with a portion of beef. Using a fork, flatten beef on top of tortilla into an even layer, leaving a 1/2" border. Sprinkle with 1/2 teaspoon burger seasoning; season with a pinch of salt.
2. In a large skillet over medium-high heat, heat 2 tablespoons of oil and swirl the pan to coat. Arrange 2 tacos beef side down and press into skillet to flatten with a sturdy spatula or burger press. Cook, undisturbed, until beef is browned and cooked through, 2 to 3 minutes. Flip tacos, top each with a slice of cheese, and cook until cheese is slightly melty, about 1 minute more. Transfer to a baking sheet. Repeat with remaining 4 burger tacos.
3. Top each taco with burger sauce, pickles, lettuce, onion, and sesame seeds.

Source: Delish