Where does “sincebollista” come from?

sincebollista (Spanish) comes from Spanish cebolla, from Old Spanish cebolla, from Late Latin cepulla, from Latin cēpa — onion.

sincebollista (Spanish): someone who asserts that onion should not be an ingredient in Spanish omelettes

Definitions

sincebollista traces back through two separate lines of ancestry.

Step	Language	Word	Meaning
1	Spanish	cebolla	onion
2	Old Spanish	cebolla	onion
3	Late Latin	cepulla	onion-bed, onion-field; small onion
4	Latin	cēpa	onion

Step	Language	Word	Meaning
1	Spanish	sin	without
2	Old Spanish	sin	without
3	Latin	sine	without; second-person singular present active...
4	Proto-Indo-European	swé	self