1. Bring 6 cups of water to a boil.
2. Add salt, red pepper flakes, ginger root peel and let simmer for 10 minutes.
3. Remove and discard the ginger peel.
4. Add frozen pelmeni, bring back to a boil and cook for 8 minutes.
5. Add bok choy and cook for another 5 minutes.
6. Stir in sesame oil and cook for 2 more minutes.
7. Serve in a large bowl. Garnish with green onions.