I used my Tahini in cheese sandwiches instead of butter, & it's nice in salads, instead of the other oils, as it does some some oil in the jar. 1 could probably look up on line, for other uses for it. I just haven't got around to doing that yet, but I did use up my last jar of it, without it going off. It keeps for ages in the fridge. I bet the useably date isn't for about 12 months or more!
Nominating a handful of ingredients would be far easier! Although if I need to choose only two, one would definitely be salmon.
I always buy a 4-pack of salmon every week and BBQ them on a Sunday afternoon so that I have cold salmon pieces available for my lunches all week. I'll eat the salmon in various salad style configurations, normally throwing in some green beans, pepitas, kalamata olives, baby spinach or butter leaf lettuce.
The second ingredient would need to be tahini. I use a lot of tahini to flavour foods.
Probably butter as I do a lot of baking with my grandchildren and salt as I like my food to be tasty. However I don't salt again once its cooked. Exceptions to that would be boiled eggs, fresh tomato and roast potatoes.