In a medium saucepan, mix sugar and cornstarch. Stir in milk, lemon rind and juice until sugar is dissolved. Add margarine. Stirring over medium heat, bring to a boil and boil for 1 to 2 minutes or until thickened. Remove from heat.
Gradually stir about one-third of the hot mixture into the egg yolks, then stir back into hot mixture in saucepan. Cook and stir over low heat 2 minutes longer. Cool slightly. Stir in sour cream until well blended. Transfer to a bowl, cover and chill.
Fill tart shells up to 1 hour before serving. Garnish with whipped topping and gumdrops cut into flower shapes with lemon rind centers. Refrigerate leftovers.
This Lemon Sour Cream Tarts recipe is from the Customers' Cookbook Cookbook. Download this Cookbook today.
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