Wash and Prep the Ingredients: Rinse the cucumbers, tomatoes, and dill thoroughly. Slice the cucumbers thinly, halve the tomatoes, and slice the red onion as finely as possible for a delicate crunch.
Mix the Dressing: In a bowl or jar, combine olive oil, vinegar, Dijon mustard, minced garlic, honey (if using), and chopped dill. Whisk until smooth and slightly thickened. Adjust salt and pepper to taste.
Combine Everything: In a large salad bowl, combine cucumbers, tomatoes, and onions.
Add the Vinaigrette: Pour the dressing over the vegetables and toss lightly with tongs until evenly coated.
Rest and Serve: Let the salad rest for about 10–15 minutes in the refrigerator to enhance the flavor. Serve chilled.