A big pot of soup simmering on the stove is a classic winter dish. If a taste of your creation leaves a bitter taste in your mouth, don't fret. There's a reason for it and way to fix it.
Add 1 tsp. of either brown or white sugar or honey to the pot. These reduce the bitterness of coffee and do the same for soups made bitter by their ingredients, especially green vegetables or tomatoes.
Stir the soup and allow it to simmer for five more minutes. Taste it again.
If the soup is still not to your liking, continue adding 1 tsp. at a time and waiting five minutes before tasting.