"Tangy mustard, tart apples, sharp cheddar, and crusty bread work together to make seriously delicious grilled cheese sandwiches...."
INGREDIENTS
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1-1/2 tablespoons salted butter, at room temperature
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4 slices sourdough bread
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2 teaspoons whole-grain mustard
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1/3 large firm-tart apple (about 3 ounces; see "Apple notes," below), unpeeled cored, and sliced very thin
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4 ounces sharp Cheddar, aged Gouda, Gruyère, or Havarti cheese, thinly sliced