|Spoiler Inside: Solution to Puzzle||SelectShow>|
Mustard, relish, ketchup: There are seven combinations of up to two: none, one of the three, and the three pairs.
Chili and cheese: There are four possible combinations: none, chili, cheese, and both.
Onion, garlic, peppers: There are four possible combinations: none, onion, garlic, and pepper.
Each of the above is independent of the others so there are 7×4×4 = 112 combinations. At one hotdog per day, it will be summer before you get through them all. Better get moving!