Wash the beans and cut them diagonally into thin slices. Peel garlic and cut into thin slices. Peel the prawns, except for the tail fin, and remove the gut. Wash the shrimps and dab them dry. Wash the thyme, shake dry and remove the leaves from the stalks.
Cook the pasta in boiling salted water according to the instructions on the packet. Heat the oil and braise the garlic, thyme and beans for about 4 minutes. After 1 minute add the prawns. Add vegetable stock, bring to the boil and season with chilli sauce.
Stir the starch and 2 tablespoons of water until smooth. Thicken the sauce, bring to the boil again. Fold in the noodles and serve.