I too am american but never use ready-made I am however, shocked that eggs aren't refrigerated at the market!
Anyway, here are my favorite recipes. White mountain frosting is billowing, soft and bright white. The buttercream is silky and rich.
White Mountain:
3/4 cup sugar
1/2 tsp cream of tartar
pinch of salt
2 egg whites
1/4 cup cold water
2 tsp vanilla extract
mix sugar, cream of tartar, salt, egg whites and water in the top of a double-boiler over simmering water. Beat with a whisk (electric hand beater sprays it all over the walls) until frostng stands in peaks, from 5-7 minutes. Remove from heat and keep beating for a few minutes to stiffen it a little more. It should stand in a peak when it's done. Beat n vanilla. This makes about 4 cups frosting.
Butter cream:
2 egg yolks
3/4 cup confectioners sugar
2 tsp vanilla
8 tablespoons sweet butter
pinch of salt
Combine egg yolks, sugar and salt in a mixing bowl,and beat for several minutes until very pale and thick. Add four tablespoons butter and beat until smooth. Add vanilla, then add remaining butter one tablespoon at a time, beating after each addition.
It's very good if you beat in 2 tsp of grated lemon/orange zest, or 2 tsp instant coffee powder, or 1 square melted bittersweet chocolate, or best of all, 2 tablespoons grand marnier, Contreau or Amaretto.
YUM!