- 1 yolk from a large hard-boiled egg
- 2 3/4 teaspoons white-wine vinegar
- 1 teaspoon Dijon mustard
- 1/4 teaspoon salt
- 1/8 teaspoon black pepper
- 1/4 cup olive oil
- 16 cups loosely packed mâche (lamb's lettuce; see above)
- Crumble yolk into a blender, then add vinegar, mustard, salt, and pepper and blend until combined well. With motor running, add oil in a slow stream, blending until combined well.
- Toss mâche with vinaigrette just before serving.