What is the optimal amount of sugar needed to sweeten heavy whipping cream?

I always add 10 percent of confectioners' sugar to the whipping cream, resulting in a nicely balanced, sweetened whipping cream. Webber Suggestion: Don't add the sugar at the beginning of whipping. It tends to decrease the surface tension of the liquid which means it is less likely to form a stable foam. Add towards the very end of the whipping period.

Tenbergen, Klaus. The Workbench. Modern Baking 19(1):16.

Updated: Wednesday, May 23, 2012.