Ground Beef Sliders with Spicy Mustard and Caramelized Onions Recipe

Ingredients

• 1 lb lean (93/7) ground beef
• 2 teaspoons thick Worcestershire sauce
• 1 teaspoon kosher salt, more for onions
• ½ teaspoon freshly ground black pepper
• 3 tablespoons unsalted butter
• 2 medium yellow onions, thinly sliced
• 3.5 ounces sharp white cheddar or your favorite cheese
• 10 dill pickle slices
• 10 slider or dinner rolls
• 2 tablespoons spicy mustard
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