Wash and dry lettuce. Tear into bite-sized pieces. For dressing, combine the lemon zest, juice, garlic, and vinegar (if desired), salt and pepper in blender and mix. With blender on, slowly add olive oil, continuing to mix until well blended. Immediately before serving, pour dressing over lettuce. Add grated Parmesan cheese and mix well.

Julee Rosso and Sheila Lukins (The Silver Palaters)