Cook the pasta until almost al dente; add the arugula, cook for a few moments & then drain. Meanwhile, lightly saute the shallots or garlic in the olive oil. Add the tomatoes. Cook over high heat until the sauce thickens, then season with the salt & hot pepper flakes or cayenne. Toss the pasta & arugula with the tomato sauce & serve immediately. VARIATIONS: Add the arugula to the tomato sauce rather than the pasta. Use wholewheat pasta instead of spaghetti & broccoli tops instead of the arugula. This will need more red pepper flakes. Finish with a sprinkling of fresh herbs such as basil or oregano.