1 cup reserved pasta water
1 mozzarella ball, cut into small cubes
Heat the oil in a skillet over medium-high heat. When the oil is hot, add the sausage. Use a wooden spoon to break it up. Cook about 7 minutes. Add the garlic, and sauté until golden. Add tomatoes and cook until reduced slightly. Season with salt and pepper.
In the meantime bring a large pot of salted water to a boil and cook gnocchi till done. Add gnocchi and frozen peas to the tomatoes. Thin sauce with reserved pasta water.
Pour into serving bowl. Mix in mozzarella chunks until slightly melted. Serve immediately with fresh grated Parmesan cheese.