I just had the biggest craving for a mustard and cheese sandwich. What are some of your odd food pairings that are easy to make at home?

Just as the title says. I had the BIGGEST craving for a mustard and cheese sandwich - recipe is as it sounds. Lightly toast some type of bread (I recommend sourdough, ciabatta, rye, pumpernickle), some type of mustard (splurge on this one; fancy honey mustard, dijon, or whole grain) and some type of cheese (I like swiss or sharp cheddar slices) on a sandwich.

Just curious what are some other people's go tos

bon appetit