INGREDIENTS
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1 Tbs. extra-virgin olive oil
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1 medium onion, cut into medium dice (to yield about 1-1/2 cups)
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2 tsp. granulated sugar
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1 Tbs. balsamic vinegar
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1 pint grape tomatoes, halved
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1/4 cup thinly sliced fresh basil leaves
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Kosher salt and freshly ground black pepper
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2 Tbs. unsalted butter
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4 boneless rib-eye steaks, 3/4 to 1 inch thick (6 to 8 oz. each)