1. To make the vinaigrette: In a food processor fitted with the metal blade, mince the shallot. Add the vinegar, lemon juice, and mustard and process to combine. With the machine running, gradually add the oil to make an emulsified sauce. Add the salt, pepper, and arugula. Pulse until well blended. Taste and adjust the seasonings.

2. In a large salad bowl, combine the greens, vegetables, and cheese. Add the vinaigrette and toss until well coated. Divide the salad among individual plates and serve.

Advance Preparation:

The vinaigrette may be prepared 1 day in advance, covered, and refrigerated. Whisk it well before using. The salad can be prepared 2 hours ahead and refrigerated. (Since the salad is chopped with a metal knife, the lettuce may begin to brown after 2 hours.)

The clever cook could:

1. Add cooked chicken, turkey, fish, or shellfish for a main-course salad.

2. Add chopped chilled cooked green beans.