NYCers - great ice cream sandwiches are readily available. Personal favorites found at Bierkraft in Park Slope, where they mix and match homemade brownies, blondies, and cookies, with il laboratorio gelato or Blue Marble ice cream. It doesn't get any better.
Angelenos - Don't count out Diddy Riese. Easily best value and tasty, traditional flavors. You can mix and match cookie types. Also, if you make it to Milk, don't have the macaron sandwich, but rather build your own using the cookies available (personal fav being the molasses cookies) and pick your own ice cream.
ma peche! (x2)
Cole's (lamb dip + sides & pecan pie) > Philippe's
Langer's (pastrami on rye) > Canter's
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