Butter 2 cookie sheets (15 1/2 X 12); keep warm. Mix baking soda, 1 tsp water and vanilla; reserve. Mix sugar, 1 cup water and corn syrup in 3 qt saucepan. Cook over medium heat, stirring occasionally, to 240F on candy thermometer. Stir in margarine and peanuts. Stir constantly, to 300F.
Watch carefully so mixture doesn't burn. Remove from heat; stir in baking soda mixture. Pour half of mixture on each cookie sheet and Quickly spread about 1/4 in thick; cool. Break into pieces. About 6 doz. Candies; 70 calories per candy.
