Mix baking soda, 1 teaspoon water, and the vanilla. Set aside.

Mix sugar, 1 cup water, and corn syrup in 3-quart saucepan.

Cook over medium heat, stirring occasionally to 240° F on your candy thermometer, or use the ice water methods. The syrup should be in the softball stage.

Stir in butter and cashews.

Cook, stirring constantly to 300° F or until hard ball stage.

Immediately remove from heat.

Pour candy onto sheet pan and spread about 1/4 thick.

Cook and break into pieces.