- Preheat the oven to 350°F. Lightly grease (or line with parchment paper) a baking sheet.
- In a medium-sized bowl, beat together the butter, sugar, salt, and baking powder until well-blended.
- Beat in the lime juice, lime oil, sour salt (citric acid), and the egg. Blend in the flour thoroughly.
- Roll the dough into 1" balls.
- Bake the cookies for 14 to 16 minutes, until the cookies are browned on the bottom.
- Remove them from the oven, and cool on the pan for about 10 minutes before transferring to a rack.
- Mix together the sugar coating ingredients in a pan or bag.
- Gently shake and roll the still slightly warm cookies in the sugar until coated.
- Allow the cookies to cool completely, then repeat, coating again with the sugar.
- Store, well-covered, at room temperature for up to a week. If you're freezing the cookies, you may choose to recoat the cookies in sugar once they've been removed from the freezer, before serving.
Tips from our Bakers
- Sour salt (citric acid) is what gives the cookies their sour bite; if you want less tang, use just a pinch.