"The steak in these quick sandwiches is chopped by pulsing it quickly in a food processor into tender little pieces. To get your base, you’ll cook down a yellow onion and mushrooms, then finish cooking the sirloin in a flavorful mix of ketchup, Dijon mustard, and hot cherry peppers. This dish is a satisfying, comfort-food sandwich, made even more so by the melted sharp Cheddar...."
INGREDIENTS
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2 Tbs. ketchup
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1 Tbs. Dijon mustard
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1 jarred hot cherry pepper, stemmed, seeded, and chopped
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1 tsp. red wine vinegar
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1 lb. beef sirloin tips (flap meat), cut into 1-inch pieces
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Kosher salt and freshly ground black pepper
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3 Tbs. olive oil
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1 small yellow onion, halved and thinly sliced
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6 oz. sliced white mushrooms (2 cups)
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1-1/2 cups shredded sharp Cheddar
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4 long rolls, split and lightly toasted
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1-1/2 oz. baby arugula