Cucumber Mousse with Mustard Oil Vinaigrette

All the coolness we associate with cucumbers is present in this frothy mousse. In contrast to its delicacy, I like to serve it with a mustard oil vinaigrette. Mustard oil is a little hot and very aromatic, smelling exactly like mustard and tasting slightly like horseradish. Mixed with shallots, Champagne vinegar, and fresh dill, it makes the whole dish come alive.

Chill the mousse in a single attractive mold and serve it as the centerpiece of a salad plate that includes thin slices