Sidís Onion Burger
4 tbsp. canola oil
1 lb. ground beef,
gently formed into 6 balls
2 medium yellow onions,
very thinly sliced with a mandoline
or a sharp knife and divided into
6 equal portions
Kosher salt, to taste
6 slices american cheese
6 hamburger buns, toasted
1. Working in 2 batches, heat 2 tbsp. oil in a 12" cast-iron skillet over medium-high heat. Add 3 beef balls and, using the back of a spatula, press down on them until they're thin; cook for 1 minute. Top each patty with a portion of the onions; season with salt. Press onions into the meat and cook for 1 minute more.
2. Flip burgers; flatten with the spatula. Place a cheese slice on each patty and let melt while onions and meat brown. Serve on buns.
Pairing Note This burger benefits from a dark, sweet beer, like St. Peter's Old-Style Porter ($38 for 12 bottles), from a brewery in Suffolk, England. —Ania Zawieja
MAKES 6 BURGERS