INGREDIENTS
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1 (12-ounce) 1-inch thick New York strip boneless beef top loin steak
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Kosher salt
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Freshly ground black pepper
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Olive oil
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2 yellow onions, sliced in rings
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1/2 teaspoon fresh thyme leaves
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1 recipe Mustard Mayo, recipe follows
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2 mini focaccia buns, sliced in 1/2
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1/2 cup baby arugula
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3/4 cup good mayonnaise
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1 tablespoon Dijon mustard
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1 tablespoon whole-grain mustard
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2 tablespoons sour cream
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1/8 teaspoon kosher salt