Combine egg white (at room temperature) and cream of tartar in a medium mixing bowl. Beat at medium speed of an electric mixer until foamy. Add sugar, 2 tablespoons at a time, beating at high speed of an electric mixer 5 minutes or until stiff peaks form.
Spoon icing into a pastry bag fitted with a round tip. Monogram petits fours, as desired.
Oxmoor House Homestyle Recipes