In a small mixing bowl, add one part vinegar and any emulsifying ingredients to the bottom of your salad bowl. (Emulsifying ingredients include mayonnaise, honey or Dijon mustard. Lemon juice can be classified as a vinegar.) Whisk together with the seasoning (salt, ginger, etc.) until combined. Add three parts olive oil to the bowl in a thin stream, whisking continuously until the ingredients begin to emulsify and become a dressing. Whisk in any additional ingredients, such as herbs, shallots, avocado or scallions, until combined. If the dressing begins to separate, rapidly whisk together the ingredients until re-formed. Add the salad ingredients on top of the dressing and toss just before serving, or pour it down the side of the larger bowl filled with salad.