Who says meat and potatoes can't happen between two slices of bread? And so it is that thin slices of roast beef rest between peppery arugula and crisp, tangy salt-and-vinegar potato chips. In place of Gruyere, cheddar could be swapped in.
As far as classic sandwiches go, ham and cheese has to be right up there with peanut butter and jelly. Part of its appeal is its adaptability. Here, French ham mixes with nutty Gruyere and mild hard-cooked eggs. The sandwich gets its crunch from a handful of frisee and a layer of dill pickles.
The uniform heat of a panini press gives these vegetable sandwiches just the right crispness. But they can easily be made without a press: Heat the panini in a heavy skillet (preferably cast iron) over medium heat, and set another heavy skillet on top of them as they cook.