Add ingredients to pitcher and stir. Pour over ice into margarita glasses. Garnish each with a lime wheel on the rim and serve. Salt rim is optional.
Strawberry Rhubarb Puree
In a heavy saucepan over medium heat combine sugar and water. Stir to dissolve sugar. Add rhubarb and allow to simmer for 15 minutes or until tender. Add strawberries and lemon juice and simmer for 10 minutes more. Allow mixture to cool for about 10 minutes.
In batches, if necessary, puree mixture in a blender.
Add a spoonful or two to your margarita, as desired.