This simple salad is greater than the sum of its simple parts. It only has five ingredients, but they come together to create a colorful, flavorful and all-around fantastic dish.
In a serving bowl, toss the tomatoes, avocado, mozzarella and red onion to combine.
Season with salt and pepper to taste. Sprinkle Parmesan cheese over the top and serve.
Optional: Dress with your favorite zesty vinaigrette.