Fresh stevia leaves taste sweet, meatn3 says, but processed stevia has a bitter aftertaste reminiscent of diet sodas. sedimental grows stevia plants and agrees: The leaves have a pleasant licorice taste, but processed stevia extract is weird. And not all extracts are the same, sedimental points out: "In my opinion, NuNaturals is the best, cleanest tasting stevia product."
westsidegal has a solution for bitter stevia extracts: Combine them with another sugar substitute, erythritol.
Stevia plant image from Shutterstock