ammonium bicarbonate

Pronunciation: [ah-MOH-nee-uhm by-KAR-boh-nayt]

This leavener is the precursor of today's baking powder and baking soda. It's still called for in some European baking recipes, mainly for cookies. It can be purchased in drugstores but must be ground to a powder before using. Also known as hartshorn, carbonate of ammonia and powdered baking ammonia.

From The Food Lover's Companion, Fourth edition by Sharon Tyler Herbst and Ron Herbst. Copyright © 2007, 2001, 1995, 1990 by Barron's Educational Series, Inc.

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