Wash and Dry the Lettuce :Carefully separate butter lettuce leaves, rinse under cold water, and pat dry with a towel or use a salad spinner.
Prepare the Veggies: Slice radishes and cucumbers thinly using a sharp knife or mandoline. Slice or cube the avocado right before serving to prevent browning.
Make the Lemon Herb Vinaigrette: In a small mixing bowl, whisk together olive oil, lemon juice, Dijon mustard, honey, garlic, and chives until emulsified. Taste and adjust seasoning.
Combine the Ingredients: Layer butter lettuce leaves in a large salad bowl or platter. Arrange radishes and avocado slices artfully over the greens.
Add Dressing: Drizzle the lemon herb dressing evenly over the salad. Toss very gently to coat the leaves without bruising them.
Add Finishing Touches: Sprinkle toasted seeds or nuts for a little crunch, and add a final touch of salt and freshly ground pepper. Serve immediately.