Cook the pasta in plenty of water until it is done.
Fry frozen prawns in very hot oil. After a short time, add the finely chopped onions, pressed garlic, and, if you like, some chili. Depending on the degree of browning you want, finish frying the shrimp. Pour the cream mixed with the stock into the pan, add a teaspoon of pesto and the frozen spinach leaves. Simmer until the spinach is thawed. Then season with a little salt and pepper and add the parmesan.
Pour off the pasta, drain and mix with the sauce in the pan. Arrange and sprinkle with additional parmesan to taste.