Ingredients
- 1 small white onion, thinly sliced on a mandoline
- 1 lb. (500 g) grass-fed ground beef (80/20)
- 2 tsp. Worcestershire sauce
- Kosher salt
- 3 to 4 Tbs. canola oil
- 1 large yellow onion, thinly sliced
- 1/2 cup (4 oz./125 g) ketchup
- 1/2 cup (4 fl. oz./125 ml) mayonnaise
- 2 Tbs. yellow mustard
- 8 slices American cheese
- 4 potato or seeded hamburger buns, split
- Dill pickle slices for serving
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