- 1 1/2 cups sugar
- 1 cup water
- 1/2 cup unsweetened cocoa (preferably Dutch process)
- 1 teaspoon vanilla extract
- 4 tablespoons milk
- 6 cups vanilla ice cream
- Stir sugar and water in heavy medium saucepan over medium-low heat until sugar dissolves. Increase heat and bring to boil. Place cocoa in small bowl. Gradually whisk in sugar syrup. Return mixture to same saucepan. Boil 1 minute, whisking constantly. Pour into bowl. Whisk in vanilla and cool completely. Cover and chill until cold, at least 1 hour. (Syrup can be made 1 week ahead. Keep refrigerated.)
- Pour 3 tablespoons chocolate syrup and 1 tablespoon milk into blender. Add 1 1/2 cups ice cream and blend until smooth. Pour into glass. Repeat in 3 more batches, using 3 tablespoons syrup, 1 tablespoon milk and 1 1/2 cups ice cream for each milk shake.