Created by Puppitypup on November 11, 2014
Step 1: Mix brown sugar, Karo and water in small, heavy saucepan and bring to a boil over medium heat until candy thermometer reads 242 degrees.
Step 2: Meanwhile, beat egg whites in small bowl until stiff peaks form.
Step 3: Drizzle hot syrup very slowly in a thin stream into egg whites, beating continually on medium speed.
Step 4: Add vanilla, then beat on high until stiff peaks form again.
Step 5: Frost cake immediately.