Baking soda is the secret to achieving an airy texture. Whisking it in at the last minute gives the brittle its namesake appearance. Honey is used to sweeten the caramel.
SourceMartha Stewart Living, December 2010
Vegetable oil, cooking spray
1 1/2 cups sugar
1/4 cup honey
1/4 cup water
1 tablespoon baking soda
Coat a 12-by-17-inch rimmed baking sheet with cooking spray. Bring sugar, honey, and water to a boil in a medium saucepan, stirring constantly. Reduce heat to medium-high. Cook, without stirring, until a candy thermometer reaches 300 degrees. Remove from heat, and whisk in baking soda until combined and mixture bubbles. Gently pour mixture onto baking sheet without spreading. Let cool. Break into pieces.