This is just your classic butter and confectioner's sugar buttercream, flavored with orange. The key to a bright flavor is to add lemon juice - this keeps the frosting from being to sweet.
Ingredients
1 cup (2 sticks) butter, softened (I use salted)
3-4 cups of powdered sugar, preferably sifted
zest from 1 orange
3 T orange juice concentrate
2 T fresh lemon juice (I used Meyer lemons because we have a glut right now - with a standard lemon, you might try adding 1 T lemon juice to start).
Instructions
Beat the butter until creamy, and slowly add the sugar until the preferred consistency.
Beat in the orange juice and zest and the lemon juice. Adjust seasonings to taste, adding more powdered sugar to increase thickness.
Recipe by The Domestic Front at https://www.thedomesticfront.com/orangelayercake/