Grilled cheese is amazing already, and then to add pastrami and apple to the mix? Genius. This is so delicious, and the apple butter mix rounds out the sandwich so well. From Fine Cooking, this sandwich is both sweet and savory.
Side note: You may be tempted to put the apple butter mix on both bread, but don't do it. It will overpower and make the sandwich too sweet. :) Makes 2 sandwiches.