Pasta & Pizza with walnuts

2 tablespoons olive oil 3/4 cup chopped onion 1 cup arborio rice 4 cups chicken broth (or vegetable) 3 tablespoons basil pesto 3/4 cup freshly grated parmesan[...]

2 small spaghetti squash (1 1/4 to 1 1/2 pounds) 4 ounces mozzarella cheese , cut into small cubes (1 cup) 3 medium tomatoes , seeded and chopped (1 1/2 cups)[...]

salt (to taste) 2 1/2 cups milk (low-fat is fine) 2 bay leaves 1/2 lb pasta (elbow, shell, ziti, or other cut, I like rotini) 4 tablespoons butter 3[...]