Prepare peas as directed on package, omitting salt in water. DO NOT DRAIN. Combine tapioca, salt, thyme, pepper, milk, onion and margarine in medium bowl and let stand 5 minutes. Stir tapioca mixture and add to cooked peas in saucepan. Stir over medium heat until mixture comes to a boil. Pour all into blender and process until smooth or desired texture. Serve hot or chilled. Makes about 4 servings. Note: May top chilled soup with dollop of Mock Sour Cream if desired.