Thaw the creamed spinach and prawns. Set aside some prawns for garnish.
Peel the onion, chop it finely and sweat it vigorously in hot oil. Peel, press and add the garlic. Add the thawed spinach. Season with grainy stock, lemon juice, pepper and Tabasco. Then add the crème fraîche or soy cream and the thawed prawns.
In the meantime, cook the spaghetti al dente according to the instructions on the packet.
Arrange on plates and serve garnished with the remaining prawns.