Instructions: To make vinaigrette: In food processor, finely chop shallot; add watermelon cubes, vinegar and lime juice, and process until pureed. With motor running, slowly drizzle in oil until mixture is combined. (If dressing is too thick, add a little more vinegar.)

Taste. Add salt and pepper as needed. Set aside.

To make roll-ups: Line serving platter with radicchio leaves. Roll ham slices into cones and arrange around edge of platter. Place watermelon cubes in center and top with red onion rings. Drizzle salad and ham rolls with enough dressing to moisten.

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