Soften chilies in hot water for 15 minutes. Drain. Slit down center and discard seeds. Drain again. Combine chilies with next 5 ingredients (vinegar - 1/4 teaspoon salt). Let stand 2 hours at room temperature. Drain.
Heat oil in a skillet over low heat. Add minced white onion and white part of green onion, cover and cook for 10 minutes or until translucent. Add remaining ingredients except for pepper, green onion tops and salt and cook for 3 minutes or until shrimp is pink. Remove from heat.
Stir in the remaining ingredients (pepper, green onion tops and salt). Cool to room temperature.
Spoon filling into chilies and arrange on a platter. Serve at room temperature.