Step 1

In a large serving bowl toss the tomatoes, olive oil, vinegar (if using), basil, salt and pepper. Let sit on counter for 5-10 minutes.

Step 2

Meanwhile, boil 6 quarts water and add 3 tablespoons of salt to season the pasta water. Cook pasta according to package directions for 'al dente' texture.

Step 3

While pasta is cooking add the arugula to the bowl of tomatoes and let sit until the pasta is done cooking.

Step 4

When pasta is done cooking, strain, and add to the bowl of prepared ingredients. Toss to coat evenly. Let cool for 5 minutes.

Step 5

Add the mozzarella balls on top and drizzle liberally with more olive oil and a little salt and pepper. If you add the mozzarella when the pasta is too hot is will melt and not taste or look the same.

Step 6

Serve warm, room temperature, or cold!