It's burger month at Tasting Table, and the Test Kitchen is awash in patties, cheese and condiments. But we think a burger without an ice cream finale is barely worth having. So, with that in mind, we created our frozen slider: a brioche sandwich of chocolate and vanilla ice cream discs bound by a salty caramel-nut syrup. Serve the slider alone or at the tail end of a grill-out for double the burger action.