Combine equal parts sugar and water in a small sauce pan, bring to a boil and then let simmer for about 10minutes or until thickened.
Let cool, add tarragon and lemon juice and blend until smooth. Taste and add more tarragon if desired.
for the Gazpacho
Make cashew sour cream by combining ingredients in a small blender (we use Magic Bullet) and blend until smooth. You will have leftover sour cream, but we recommend making this much just to get it blending well.
Combine 1/4 sour cream with melon, agave, lemon juice and pinch of salt in a high-speed blender (we use Blendtec). You may need to do this in batches depending on the size of your blender.
Drizzle a small amount of the Tarragon Syrup over the gazpacho, garnish with fresh tarragon and serve. The syrup is very sweet so a little bit goes a long way! I recommend adding a very small amount first.