Instructions: In a small bowl whisk together the vinegar, the mustard, and salt and pepper to taste, add the oil in a stream, whisking, and whisk in the water. Peel the potato, grate it coarse, and squeeze it between several thicknesses of paper towels to remove any excess moisture.

In a non-stick skillet measuring 6 inches across the bottom heat 1/2 tablespoon of the butter over moderately high heat until the foam subsides, add half the potato, tamping it down with a spatula, and cook the potato cake, shaking the skillet frequently to keep the potato from sticking, for 6 minutes, or until the underside is golden and crisp. Turn

the potato cake, cook it for 6 minutes more, or until the underside is golden and crisp, and transfer it to a plate. Make a second potato cake in the same manner with the remaining butter and potato and transfer it to

another plate. In a bowl toss the watercress with 3 tablespoons of the dressing and spoon the remaining dressing around the potato cakes.

Arrange the onion, drained well, the watercress, and the sardines decoratively on the potato cakes.

Serves 2.

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