- Sauté onion in hot oil in large saucepan over medium heat 2 minutes. Add zucchini; sprinkle with salt and sauté 5 minutes longer. Stir in broth; cover and bring to a boil. Reduce heat; simmer 15 minutes, or until vegetables are tender.
- Remove from heat; stir in soymilk, soy sauce, nutmeg and pepper. Cool 15 minutes.
- Process half of zucchini mixture in covered blender container until smooth. Pour into large bowl. Repeat with remaining mixture.
- Cover and refrigerate 4 hours, or until thoroughly chilled.
- Spoon into individual serving bowls and sprinkle with chives, if desired.