Cut the pumpkin flesh into cubes. Toast the sesame seeds in a pan without fat.
Heat the oil in the wok and fry the garlic, ginger and pumpkin in it. Deglaze with the vegetable stock and bring to the boil. Mix the flour in a little water and add to the vegetables, simmer for 8-10 minutes. Season to taste with salt, pepper, chilli and soy sauce. Serve sprinkled with the toasted sesame seeds.