Heat first tablespoon oil in pressure cooker. Brown chicken pieces on all sides, then add salt and pepper.

Cook at pressure for 10 minutes; cool quickly. Allow chicken to cool while preparing other ingredients. Save cooking liquid.

Add enough chicken broth to reserved liquid to make 4 cups total.

Add garlic, ginger root, soy sauce, rice vinegar, and sesame oil to broth.

Heat second tablespoon of oil in a soup pot. Saute onions until tender. Add broth mixture and bring to boil.

Chop cooked chicken. Add with remaining ingredients and simmer for about 5 minutes.