"This salad should be made with the freshest ingredients possible, and is a delight as a side to most any meal! If you can't find, or don't have bocconcini, you could use another size of fresh mozzarella instead."
Combine the olive oil, vinegar, garlic, salt, and black pepper in a jar with a lid; set aside. Gently combine the spinach, arugula, tomatoes, bocconcini cheese, and onion in a pretty serving bowl. Shake the salad dressing vigorously to combine, and drizzle over the salad to serve.