This soup is full of flavor! Do be sure you use broth and not water, and remember to add salt. This recipe uses 2 teaspoons of salt. Unless you're on a low-sodium diet, not adding sufficient salt into soup is one of the biggest reasons your soup may be bland. Ingredients like lentils and potatoes require a lot of salt to bring out their natural goodness. Try adding a pinch at a time and stir. Always allow it to cook for a few more minutes to fully absorb the salt before adding more. Otherwise, you could end up with it being accidentally too salty.