Throw them out. Cooked longer than medium rare and they are like leather, cooked medium rare or rare they taste of liver.
Duck legs are gorgeous, duck breasts are a waste of time and effort. Which is why I never have roast duck.
1. They don't taste of liver.
2. What is wrong with the taste of liver?
3. On matters of high finance I have little doubt that you are pretty much a genius. As far as food and football are concerned, I am afraid it is remedial classes for you