Sweet & Spicy Caramelized Onion BBQ Grilled Cheese. Blog post drops the F-bomb...not sure why. Here's the ingredients to maybe to spare you: 8 slices challah bread 4 slices sharp cheddar 4 slices pepper jack or other spicy cheese 1 large red onion, thinly sliced 3 Tbsp butter 2-4 Tbsp BBQ sauce