Coffee Gelato

Whisk yolks and sugar in large bowl to blend. Bring milk to boil in heavy medium saucepan. Gradually whisk hot milk into egg mixture; then whisk in espresso mixture. Return mixture to saucepan. Stir over medium heat until custard thickens and leaves path on back of spoon when finger is drawn across, about 8 minutes (do not boil). Refrigerate until cold, about 3 hours.

Process custard in ice cream maker according to manufacturer's instructions. Freeze in covered container. (Can be prepared 3 days ahead. Keep frozen.)