Ingredients
- 2 tablespoons unsalted butter
- 1 large yellow onion, halved and very thinly sliced (about 2 cups)
- Kosher salt and freshly ground black pepper
- 1 1/2 pounds coarse-ground 80- or 85-percent lean sirloin beef
- 2 cups all-purpose flour
- 1/2 cup canola oil
- 8 slices American cheese
- 4 hamburger buns with sesame seeds, brushed lightly with unsalted butter and toasted
- 4 dill pickle spears
- French fries, for serving
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