In a small bowl, stir together the mayonnaise with the mustard. Toss the herb salad mix in a separate small bowl with the extra-virgin olive oil, lemon juice and some salt and pepper.
Slather both cut sides of the bread with the mayonnaise-mustard mixture. On one slice of bread, layer on the meatloaf slices, pickles and then the salad. Top with the second slice of bread, slice and serve.
Recipe courtesy of Geoffrey Zakarian