Chicken. Perhaps it is less the ingredient in this case than the techniques associated.
It's not that I didn't each chicken, but learning to roast a whole chicken was the gateway to real day-to-day cooking for me. I'd roast a chicken on the weekend, make sandwiches or salad with leftovers, make broth with the carcass, make soup or pot pie or gravy with broth and other leftovers, etc. Before cooking was something that seemed like a special occasion but now I had something that sort of begot more food naturally.
If I had to pick a single ingredient, probably cumin or curry spice if I can be allowed to cheat. So many dishes to add that to.
I can only say that I spend less time on beehaw because there are communities on both of those instances I want to interact with. This isn't really an argument to refederate because as an end user I can filter the noise and focus on the communities I want, but I know admins don't have that luxury. It's more of an impact statement. I like beehaw, and I don't want to leave, but I do probably spend more time with my other account just because there's more activity I'm interested in there. So I fully support whatever decision gets made and certainly support this community, but I can't be the only user whos spending less time here than I otherwise might.