Too big is my problem. For some reason over the last two years or more, onions sold here have been getting bigger and bigger. They are now the size of bowling balls. I stopped buying them; living alone I never cooked anything that required that much onion and if I cut them up, I usually ended up throwing most away.
Now I only use shallots, which I prefer anyway. Next time I decide to make a dopiaza for the entire neighbourhood, I may buy an onion.