CINNAMALDEHYDE
FROM CINNAMON · the cinnamon spice
The aldehyde that makes cinnamon taste like cinnamon, roughly 90% of cinnamon bark oil by volume. Triggers TRPA1 (the "wasabi receptor") at high doses, which is why Red Hots burn and a cinnamon stick steeped too long in mulled wine turns acrid. Cassia cinnamon (the common grocery-store kind) carries more than the milder Ceylon variety.
ALSO IN Oaxaca Old Fashioned · Hot Buttered Rum · Tom and Jerry · Mulled Wine · Tommy Gun