Apple and Mustard Grilled Cheese Sandwiches
Ingredients (Items in bold can be purchased from Grobe Fruit Farm when in season 1 1/2 tablespoons salted butter, at room temperature 4 slices of sourdough bread 2 teaspoons whole-grain mustard 1/3 of a large firm-tart apple (Jonathon, Cortland), unpeeled, cored, and sliced very thin 4 ounces sharp cheddar, aged Gouda, Gruyere, or Havarti cheese, …