Step 1

To make the ranch dressing, in a medium bowl, whisk together buttermilk, mayonnaise, sour cream, red onion, dill, parsley, garlic, lemon juice, sugar, and salt and pepper to taste (I like 1/2 teaspoon salt and 1/4 teaspoon pepper). Refrigerate at least 10 minutes to blend flavors. Whisk to recombine before serving.

Step 2

To assemble the salad, in a large bowl, combine lettuce, endive, tomatoes, radishes, carrots, and cucumbers. Drizzle with salad dressing and toss until evenly coated.