Ingredients
1 cup sour cream
½ cup mixed finely chopped fresh chives, dill and parsley
⅓ cup ketchup
¼ cup buttermilk
¼ cup pickle relish
1 tbsp. Worcestershire sauce
Salt and pepper
2 ¼ lbs. 80% lean ground beef
Olive oil, for drizzling
4 slices yellow American cheese
4 slices yellow sharp cheddar
4 sesame-seed hamburger buns or sesame brioche buns, halved and lightly toasted
Sliced dill pickles
1 small white onion, finely chopped
Thinly sliced iceberg or little gem lettuce
Directions
Step 1
In a medium bowl, mix the sour cream, herbs, ketchup, buttermilk, relish and Worcestershire; season the sauce with salt and pepper.
Step 2
Heat a cast-iron skillet, griddle or grill over medium-high. In another medium bowl, season the beef and form 8 very thin, large patties. Drizzle the skillet with oil; add 4 patties and cook, turning occasionally, 6 to 7 minutes. Top 2 of the patties with a slice of each of the cheeses during the last minute or so of cooking. Top each with another cooked patty to melt the cheese; transfer to a plate. Repeat with the remaining patties and cheese.
Step 3
Top the bun bottoms with the pickles and onion, the double patties, then the lettuce. Top with some of the sauce and the bun tops.