Combine sugar, corn syrup, and hot water. Heat, stirring until sugar dissolves. Then boil without stirring to firm ball stage (244* to 248* on candy thermometer; in humid weather cook to 248*). Beat egg whites stiff. Slowly add hot syrup, beating at high speed until thick and fluffy. Add salt and vanilla. Gently fold in mayonnaise and orange rind.
**Tip**.
If thicker then disred, fold in 1 or 2 tablespoons more mayonnaise, or 1 or 2 teaspoons water.