Spicy exchange / 2022
Do onions have capsaicin?
Specifically, raw onions contain propyl propanethiosulfonate, propenyl propanethiosulfonate thiopropanal S-oxide, and propyl methanethiosulfonatem which contribute to the flavor profile and spiciness.
The sulfur content of the soil and the duration of growing can make onions spicier or less spicy. Spring onions tend to be sweeter, and autumn storage onions tend to be spicier.
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