Is IHOP Cooked Onion High in Histamine?

IHOP Cooked Onion

Moderate histamine

IHOP Cooked Onion is moderate, driven mainly by the hydrogenated soybean oil it is cooked in.

Most of this is cooked to order, which is the best case for histamine. Even so, a restaurant kitchen preps ahead and holds things warm through a service, so freshness varies more than it would at home. The rating above comes from the chain's published ingredients. If a dish is borderline for you, asking how it is prepared tells you more than the menu does.

This is simply yellow onion cooked down with oil, salt, and flavorings.

The soybean oil blend leads — the liquid and hydrogenated soybean oil is what nudges this into moderate territory rather than the onion itself.
The onion is the mild part — yellow onion on its own is gentle, so the dish sits moderate because of the cooking oil and additives rather than the vegetable.

Asking for onions sauteed in plain butter or oil keeps things simpler.

This rating comes from IHOP's own published ingredient statement, read on August 11, 2026. Restaurant recipes vary by location and change over time, so always check the current listing: source 1, source 2. How we rate foods →

IHOP Cooked Onion and IHOP are trademarks of their respective owners. This page is an independent histamine reference and is not affiliated with, endorsed by, or sponsored by the brand.