Make the dressing. In your serving bowl combine the olive oil, vinegar, garlic, salt, pepper, mustard, shallot, herbs, capers, and green onion. Stir to combine.
5 tablespoons olive oil, ¼ cup apple cider vinegar, 2 cloves garlic, ½ teaspoon sea salt, 1 teaspoon black pepper, 1 tablespoon grainy mustard, ½ cup diced shallot, ¼ cup chopped dill, ½ cup chopped parsley, 1 tablespoon chopped chives, 2 tablespoons capers, 1 green onion