INGREDIENTS
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BURGERS:
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1 tablespoon extra-virgin olive oil
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1/4 teaspoon kosher salt
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1/4 teaspoon freshly ground black pepper
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1 pound lean ground buffalo or bison
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1 ounce grated Parmigiano-Reggiano cheese (about 1/4 cup)
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Cooking spray
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4 (1 1/2-ounce) hamburger buns, toasted
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1 cup baby arugula
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4 thin slices red onion
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4 tablespoons Balsamic Ketchup