Ammonia Cookies, also known as Lemon Crackers, are an old-fashioned treat that showcases the use of baker’s ammonia (ammonium carbonate), once common in European and early American baking. These cookies are crisp, light, and delicately flavored with lemon oil. They’re easy to roll and cut into shapes, often sprinkled with colored sugar for a festive finish. Despite the unusual leavening agent, they bake up with a clean flavor and no residual taste of ammonia, making them a unique addition to any vintage cookie collection.
Dissolve 1 oz powdered ammonia in ¼ cup warm water. Let it stand until fully softened and dissolved.
Step 2: Cream Shortening and Sugar
In a large bowl, cream together the Crisco and sugar until smooth and fluffy.
Step 3: Add Eggs and Lemon Oil
Beat in the eggs and lemon oil until fully incorporated.
Step 4: Combine Liquids and Dry Ingredients
Add the dissolved ammonia and salt to the milk. Alternate adding the milk mixture and flour (6–7 cups) to the creamed mixture, stirring after each addition until a soft dough forms.
Step 5: Roll and Cut Dough
On a well-floured surface, roll out the dough. Cut into squares or circles with a knife or cookie cutter. Add more flour as needed to handle the dough—it should be soft but not sticky.
Step 6: Finish and Bake
Place cookies on an ungreased baking sheet. Prick each with a fork and sprinkle with colored sugar if desired.
Bake at 400°F until lightly browned (about 8–10 minutes).
Tips
You can substitute lemon extract for lemon oil, using 1 tbsp instead.
Dough can be chilled for easier handling before rolling.
For extra crispness, roll the dough thinly.
Colored sugar is optional but adds a festive touch.
Store baked cookies in an airtight container for extended crispness.