If I had to pick one, Sriracha.
I typically mix things together for different meals. For mac and cheese I add mayo, sriracha, minced garlic, and green onion.
For hot dogs I use sriracha and sauerkraut. Sometimes cranberry mustard and feta.
For pita I use hummus, sriracha, tzatziki, feta, balela, tilapia, and basil balsamic vinaigrette.
Pizza gets sriracha.
Spaghetti gets tobasco and feta.
Meatloaf gets hummus and sriracha with dried mint and oregano, or bleu cheese. I like to put different stuff on leftovers.
Buffalo wings get sriracha and bleu cheese with green onion.
Ham gets labne and dried mint.
Fries get a sauce I make consisting of mayo, sriracha, minced garlic, and sweet mesquite seasoning.