Celeriac Salad

This is a simplified, lightened version of the traditional French favorite céleri-rave rémoulade. For variation, toss with walnuts or toasted hazelnuts; modify the flavor by sprinkling with tarragon, dill, thyme, or marjoram; add tiny cubes of smoked meat and capers; or use as part of an antipasto or appetizer plate, along with dry sausage, olives, pickles, hard-cooked eggs, and such.