How to Make It
Whisk together mayonnaise, dill, vinegar, buttermilk, honey, and 1/2 teaspoon each of the salt and pepper in a bowl.
Spread lettuce on a platter; arrange tomatoes on top. Toss together corn, cucumber, and remaining 1/2 teaspoon each salt and pepper. Arrange corn mixture and trout over tomatoes. Drizzle with dressing. Sprinkle with basil.