Here's the recipe for Architectural Icing for making any gingerbread or
graham cracker houses. It's the best. You can make bigger batches, but
don't let it dry out if you have too much. Keep it covered and even
refrigerated if you need to.
Mix the following on high speed for 5-8 minutes:
3 egg whites,
1/2 t. cream of tartar
1 box powdered sugar
1/2 t. lemon or orange extract
(Use a grease free utensils and bowl)
Beat until stiff and peaked. icing dries quickly, so keep covered with
damp cloth while in use. Fill decorating tube and assemble house or other
project. Or use a spreading knife.
For "Flow or Covering Icing:
Add water until Architectural Icing is slight thin. Use to fill in
outlines and for other decorating.
Any of these icings can be colored, but white is most versatile. Use
candy and cookies for decorating.