1. Heat oil in a large pot over medium-high heat. Add chopped ginger, onion, and miso. Sauté four minutes. Add mushrooms and sauté two minutes. Add stock, chicken, and bok choy. Reduce heat and simmer eight minutes.
2. While soup simmers, prepare rice according to package directions.
3. Stir rice, soy sauce, and salt into the soup. Cook four minutes or until bok choy is tender. Remove from heat and stir in lime zest and juice.