Step 1In a medium saucepan, combine the milk and sugar. Cook over medium heat, stirring until the sugar is dissolved, about 5 minutes.
Step 2Remove from heat and stir in the vanilla paste, vanilla extract and one-half teaspoon cinnamon. Allow the mixture to cool, then cover and refrigerate for several hours or overnight.
Step 3Transfer the mixture to an ice cream maker or gelato machine and process according to the manufacturer's instructions. Place in a container and freeze. Makes 1 quart.
Step 1Allow the gelato to sit out for about 10 minutes before scooping. Make the shakes in two batches. In a shake machine or blender, mix four (4-ounce) rounded scoops of gelato, one-half cup milk and one-quarter cup heavy cream. Blend until smooth. Pour into two glasses. Repeat.
Step 2Top each shake with a dollop of whipped cream and a sprinkling of cinnamon.