Brown chicken in hot oil in Dutch oven or large saucepan over medium-high heat.
Remove chicken from pan. Drain off excess fat, reserving about 1 tablespoon.
Add carrots, celery and onion; sauté 3 minutes. Stir in 5 1/2 cups water, soy
sauce and chicken. Bring to boil; cover and simmer 15 minutes. Remove chicken;
cool.
Meanwhile, cook tortellini according to package directions; drain. Remove skin
and bone from chicken and cut meat into bite-size pieces.
Stir chicken into soup; bring to a boil. Stir in tortellini and heat through.