Diner Style Double Wagyu Smash Burger - The Grill Dads

Ingredients

• 1 pound American Wagyu Ground Beef
• Kosher salt (for seasoning)
• Black pepper (for seasoning)
• Oil (for the pan)
• 1 small white onion (very thinly sliced)
• 2 potato hamburger buns
• 4 slices American cheese
• Pickles
• 1/2 small head iceberg lettuce (shredded)
• 1 cup mayo
• 1/4 cup ketchup
• 3 tablespoons sweet relish
• 1 tablespoon garlic powder
• 1 tablespoon Salt Pepper + Three Chiles (from Spiceology)