Heat 1 tablespoon oil over medium-high heat in a Dutch oven. Add red pepper and garlic; sauté 20 seconds. Add tomato and arugula; saute 2 minutes or until arugula is wilted. Spoon into a large bowl. Add 1 tablespoon oil, spaghetti, vinegar, salt, and black pepper; toss well. Sprinkle with cheese.