To make this Ocean State specialty, chilled coffee and whole milk are blended with coffee ice cream and a homemade coffee syrup.
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For the Coffee Syrup:
For the Coffee Cabinet:
In a medium saucepan dissolve sugar in coffee. Bring mixture to a light boil then reduce to simmer. Simmer until the mixture has reduced to form a slightly thickened syrup, about 15 minutes (see note). Remove from heat and whisk in vanilla extract. Refrigerate and allow to cool, about 15 minutes.
Add ice cream, milk, chilled coffee and coffee syrup to blender. Blend until smooth. If you prefer a thinner shake, you can add additional milk and/or chilled coffee, if desired.