Meanwhile, make the modeling chocolate to use for the cheese and lettuce. Place finely chopped pure white chocolate or white confectionery coating wafers in a microwave safe bowl. Heat for 40 seconds, then stir, heat 30 more seconds then let sit for 1 minute. Stir vigorously. If needed, heat for 10 second increments, stirring after each, until melted. Allow chocolate to cool to between 88 and 91°F, stirring often while it cools. Pour in corn syrup.