In shallow bowl, combine parsley, mint, thyme and pepper. Set aside.
Spread mustard evenly over all sides of tenderloin.
Spread herb mixture out on a piece of wax paper and roll tenderloin in herb mixture to coat.
Place tenderloin on rimmed baking sheet. Roast 20-25 minutes or until instant-read thermometer registers 155°F.
Remove tenderloin onto a clean plate or cutting board. Tent loosely with foil and let tenderloin rest 5 minutes before carving into ¼-inch thick slices.
For the dressing:
In 1-cup measuring cup, whisk together oil, vinegar, mustard, shallot, garlic and parsley.
Season dressing with salt and pepper according to taste. Set aside.
For the salad:
Divide lettuce evenly among 4 plates.
Arrange potatoes, beans, tomatoes and hard cooked eggs decoratively on each plate.