Fresh herbs may lose their flavor when cooked for a long period time so add more herbs shortly before serving to boost the flavor.
Soup too salty? Try adding a teaspoon of sugar and a teaspoon of cider vinegar to combat the saltiness, or try adding a raw potato to the soup to absorb some of the extra salt.
Soup too sweet? Try adding a little salt to tame down the sweetness or 1 teaspoon of apple cider or white vinegar. Taste test after each addition so that the taste of the soup doesn't change too much or become too salty.
To remove fat from soup or stock, add ice cubes to the soup, stir to allow fat to collect on the ice cubes, and then remove before they have melted.
Another method to remove fat is to allow the soup to cool by placing it in the refrigerator for a couple of hours. The fat will have solidified on top and can then be easily scraped off.