A similar entry appears in the Wheel of Time Companion confirming the information available in the main story arc.
Ice peppers are a type of vegetable grown in Saldaea (TGH, Ch. 9; TSR, Ch. 41). They grow particularly well near the Banikhan Mountains (KoD, Ch. 20). They are mentioned several times throughout the series as a type of trade good from Saldaea (NS, Ch. 13; TGH, Ch. 9; TDR, Ch. 33; TSR, Ch. 41; KoD, Ch. 20; ToM, Ch. 11).
There appear to be different kinds of ice peppers. White ice peppers are incredibly hot (TSR, Ch. 51).
Amathera is said to like ice peppers (TSR, Ch. 51). When the Black Ajah takes her captive, Temaile forces her to eat a great deal of ice peppers and will not allow her to drink water until she begs (TSR, Ch. 54).