Steakhouse Burger

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Steakhouse Spice Mix:

2 teaspoons cracked black peppercorns

1 1/2 teaspoons dried minced garlic

1 1/2 teaspoons dried minced onion

1 1/2 teaspoons dried parsley

1/2 teaspoon dry mustard

1/2 teaspoon crushed red pepper flakes

Burger:

12 ounces beef chuck, coarsely ground

12 ounces beef sirloin, coarsely ground

Kosher salt and freshly ground black pepper

2 tablespoons unsalted butter, at room temperature