2/3 c. milk
2 c. sugar
1/8 tsp. salt
2 tbsp. butter
2 1/2 tsp. vanilla extract

In heavy saucepan combine first 3 ingredients. Stir until sugar dissolves and comes to a full boil, cook slowly without stirring, 236 degrees on candy thermometer (soft ball stage). Remove from heat and add butter and vanilla extract. DO NOT STIR UNTIL LUKEWARM, then beat until thick. Turn into a buttered 8 inch square pan. Cut into squares when cool.