1 Halve the endives lengthwise and cut out the tough center stalk. Separate the lettuce leaves. Rinse tomatoes, arugula, lettuce, and endive well, shake dry and cut into bite-size pieces. Halve tomatoes and cut into slices. Arrange all the vegetables on plates. Rinse the parsley, shake dry and remove leaves. Make a dressing by mixing the vinegar, oil, and mustard. Season with salt and pepper and sprinkle over the salad and garnish with parsley.
2 Bring water and vinegar to a boil. Crack the eggs one at a time into a cup, then gently slide into the vinegar water. Poach each egg for 4 minutes and remove from the water with a slotted spoon. Arrange the eggs on top of the salad and sprinkle with freshly ground pepper.