In a large mixing bowl, combine mixed lettuce leaves, arugula, chopped cucumber, sliced radish, and diced red onion. Add pitted olives and a sprinkling of sunflower seeds to enhance crunch. Carefully wash and dry your greens beforehand to keep them crisp.

In a separate small bowl, whisk together the olive oil, balsamic vinegar, apple cider vinegar, and Dijon mustard. Add a pinch of sugar along with salt and pepper to taste to create a balanced dressing.

Just before serving, drizzle the prepared dressing over the salad base in your large bowl. Using tongs or a large spoon, gently toss everything together until the vegetables are evenly coated.

For the best texture, serve your Colorful and Crunchy Tossed Salad immediately after tossing. Arrange it elegantly on plates or in bowls.