Optional: Sour cream and chopped chives or fresh dill sprigs
In a saucepan, bring the beets, carrots, onion, water and salt to a boil. Reduce heat; cover and simmer for 20 minutes. Add broth, cabbage and butter; simmer, uncovered, for 15 minutes. Just before serving, stir in lemon juice. If desired, top each serving with sour cream and chives or dill.