In a small saucepan or dipping bowl stir stevia and vanilla powder into lemon juice and vinegar.
Heat the sauce on the stove or in the microwave.
Pour into a dipping bowl. Dip fresh fruit into the warm sauce and enjoy.
Phase 3 modifications: Stir in 1 tablespoon of cold butter cut into small cubes and whisk quickly until blended. Or add a small amount of cream and omit the lemon juice. Add a little cinnamon or rum extract for added flavor.