Add Water and simmer for 20 minutes. Allow mixture to cool and puree with hand blender until smooth.
Let sit for up to 24 hours at room temperature. Heat sauce over medium heat and add Vinegar, Saint Germain, and Corn Starch solution and simmer for 20 minutes.
Remove from heat and strain mixture through a mesh strainer. Discard solids or save to make a powder.
Recipe Notes
This came out runny with some solids on the top. Might try reducing oil and increasing corn starch.