- Cream the margarine and shortening until fluffy.
- Add the salt and powdered sugar slowly. You can add a little of the dairy-free milk as you are trying to mix in all the powdered sugar if things get too thick.
- Once all the powdered sugar is mixed in, you can start adding dairy-free milk until you get the frosting thickness you want. Sometimes I like it dense, sometimes I like it fluffy and mousse-like.
- Add the lemon oil and vanilla at the end.