Potatoes, spuds, murphies - I'll have no truck with this pious fiction that potatoes somehow aren't vegetables/don't count. Populations have survived on little else before now...
Actually though, for me, myself, personally, like (!) I have, like some others here, to plump for the alliums - there's no starting without an onion, and a meal without garlic is like a day without sunshine... or so I have heard.
The Jains don't eat them, as they fear the destruction of tiny beasties in harvesting them from the earth, and have to make do with a pinch of asafoedita which can smell a bit like onions frying... I suppose they mean well.