Step 1

Place a large pasta pot filled 2/3 with water over high heat and bring to a boil. Add a few pinches of salt to the water. Cook the pasta for the lowest time listed on the package.

Step 2

Meanwhile, chop the tomatoes into small bite-sized pieces and place them in a large heatproof mixing bowl. Sprinkle salt and pepper over the top. Add the olive oil, red wine vinegar, to the bowl and toss gently together.

Step 3

Thinly slice the onion if using. Add it to the mixing bowl and toss.

Step 4

Drain the pasta and then immediately place the pasta on top of the tomato mixture in the bowl. Let the heat of the pasta warm the veggies for 2 - 3 minutes and then gently toss the noodles with the dressing.

Step 5

Gently stir in the arugula. Serve with grated parmesan over the top.