Instructions: In medium saucepan, combine sugar and cornstarch. Stir in milk. Cook and stir over moderate heat until thickened and bubbly. Remove from heat; cool to lukewarm. Add vanilla and yogurt. Refrigerate until mixture is cold.

Melt chocolate. While chocolate is hot, pour it very slowly into chilled yogurt mixture while stirring gently. Freeze in ice-cream maker according to manufacturers directions; or follow refrigerator-freezer instructions previously posted.

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