In blender or food processor, place thawed raspberries and any juice. Cover; blend until pureed. Set strainer over 2-cup measuring cup. Press puree with back of spoon through strainer to remove seeds. If necessary, add water to raspberry puree to measure 1/2 cup. In 1-quart saucepan, mix cornstarch and sugar. Gradually add raspberry puree. Cook over low heat, stirring constantly, until thickened. Fold in fresh raspberries; spread over crust. Refrigerate 15 minutes.