The cotoletta sandwich con rucola solves the breaded cutlet's central problem by choosing a cut that does not fight the crust. A cotoletta alla milanese is veal pounded thin, egged, crumbed, and fried in butter until the coating shatters, and the whole point of putting it in bread is to keep that shatter intact. Where a juicy tomato top wages a slow war on the crisp coating, peppery rocket brings the same job, cutting the fat and richness of the fried slab, with almost none of the water. The defining choice here is dry against fried: a green, bitter, structurally light leaf set against a hot, crisp, buttery cutlet, so the crumb survives the journey from pan to hand far better than the tomato version allows.
The craft is still timing and moisture, just with the odds improved. The cutlet is fried to order and the sandwich assembled immediately, because the enemy is the cutlet's own steam softening its coating from within, and that clock runs whatever goes on top. The bread is plain and lightly built, a rosetta or ciabatta, sometimes briefly toasted on the inner face so it does not sog from the heat alone. The rocket is added dry, dressed with only a few drops of lemon and a thread of olive oil at the last second, never a wet dressing that would do the tomato's damage by another route. Because the cutlet is seasoned in its crumb and the rocket carries its own pepper, added salt is light. A shaving of Grana over the leaves is a common move, deepening the savour without adding water. Eaten fresh, the bite goes crisp, then meaty, then bitter and bright, with the coating still audible.
The variations turn on what joins the rocket without wetting the crust: the lemon-and-Grana version, the one with a thin film of mayonnaise under the leaves, and its juicier sibling that takes fresh tomato instead, which is the Cotoletta Sandwich con Pomodoro and a softer, riskier balance. Those, and the broader run of Milanese breaded-cutlet panini, deserve their own articles rather than being crowded in here.