In large bowl, combine 2/3 cup water and meringue powder; whip with electric mixer at high speed until peaks form. Add 4 cups sugar, one cup at a time, beating at low speed after each addition. Add remaining 8 cups sugar and 3 tablespoons water, shortening and corn syrup in 3 additions, blending well after each. Add salt and flavorings; beat at low speed until smooth. Keep bowl covered with a damp cloth until ready to use. For best results, keep icing bowl in refrigerator when not in use. Refrigerated in an airtight
container, this icing can be stored 2 weeks. Rewhip before using.
For thin (spreading) consistency icing, add up to 4 more tablespoons each water and corn syrup.
NOTE: Changes in Wilton's traditional recipes have been made due to Trans Fat Free Shortening replacing Hydrogenated Shortening.
The traditional choice for flavor and versatility. Buttercream is softer and more spreadable than most icings. Use for icing cakes, piping borders, writing, flowers, etc. Buttercream can also be prepared with all shortening, resulting in a pure white icing.