In a medium-size saucepan, place all ingredients except yogurt,
lemon juice and bell pepper; bring to a boil. Reduce heat, skim
off any froth that accumulates, cover and simmer 10 minutes or
until zucchini is tender. Cool.
In a blender or a food processor fitted with the metal blade,
process in batches until pureed. Add yogurt and lemon juice;
chill well. Garnish with bell peppers.