Instructions: Make the dressing:
In a blender blend together the shallot, the mustard, the vinegar, and salt and pepper to taste, with the motor running add the oil in a stream, and blend the dressing until it is emulsified. The dressing may be made 2 days in advance and kept chilled in a tightly sealed jar.

In a large saucepan combine the potatoes with enough water to cover them by 1 inch and simmer them for 20 minutes, or until they are tender. Drain the potatoes, peel them, and let them cool. The potatoes may be prepared up to this point 1 day in advance and kept covered and chilled. Slice the potatoes 1/4 inch thick and arrange them decoratively on a platter with the tomatoes, cut into wedges, and the mustard greens. Pour the dressing over the salad and sprinkle the salad with the chives.

Serves 8.

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