piperine
or capsaicin
hmm
both! *dumps red pepper and grinds black pepper onto its pasta*
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tip: black pepper is a much better spice than you probably think. Get yourself a pepper grinder, even store-brand pepper you can usually buy in little plastic grinders that work perfectly acceptably.
The chemicals responsible for its flavor, piperine and chavicine, both evaporate very quickly, so freshly-ground black pepper has a much stronger and better taste than pepper that's already been ground into flakes
oh, oops, I meant to make this public, not unlisted. I thikn boosting it will fix that?? maybe?? how does that work