Pour the broth into the frying pan where the duck was fried, add dry red wine, 1 tbsp soy sauce, sugar, salt, pepper. When the mixture boils, add the cherries.
Pour the sauce into a saucepan (you can continue to cook in a frying pan) and evaporate the sauce twice (about an hour of cooking). If you need to cook the sauce faster, then you can fill it with a small amount of starch.