1/2 pound fresh spinach, coarse stems discarded and leaves washed well and spun dry
10 ounces fresh white mushrooms
Directions
In a small bowl whisk together yolks, vinegar, and mustard and add oil in a stream, whisking constantly until dressing is emulsified. Stir in whites, shallots, tarragon, and salt and pepper to taste.
Thinly slice spinach leaves and spread on a platter. Cut mushrooms into very thin slices and mound on spinster. Spoon dressing over salad.