In a medium bowl, whisk together mayonnaise, buttermilk, Parmesan cheese, and vinegar until combined.
¼ cup buttermilk, ¼ cup freshly-grated Parmesan cheese, 2 tablespoons mayonnaise, 1 ½ teaspoons apple cider vinegar
In a large bowl, toss together rice, corn, pimentos, ½ cup of the green onions, bacon, basil and dill. Stir in the dressing and toss to coat. Taste and season with additional salt, pepper or fresh herbs. Sprinkle with the remaining ¼ cup of green onions. Serve cold or at room temperature.
2 cups cooked rice, at room temperature, 2 cups fresh corn off the cob or thawed frozen whole kernel corn, 8 ounces diced pimentos, drained, ¾ cup thinly sliced green onions, divided, 3 slices bacon, cooked and chopped, 2 tablespoons chopped fresh basil, or more to taste, 1 tablespoon minced fresh dill, or more to taste, Salt and pepper, to taste