Briny anchovies and Castelvetrano olives temper the bitterness of escarole in this lively salad, while julienned strips of lemon zest add brightness.
Using a vegetable peeler, peel lemon zest in long strips. With a very sharp knife, slice strips into a fine julienne. Squeeze 1 tablespoon juice.
In a small bowl, combine lemon juice, garlic, anchovies, and mustard. Slowly whisk in oil in a steady stream until emulsified. Season with salt and pepper.
Combine zest, escarole, and olives in a large bowl. Season with salt and pepper. Drizzle with 3 tablespoons dressing; toss to combine. Add more dressing as desired; serve. (Extra dressing can be stored in refrigerator up to 2 days.)