From: Fuchsia Dunlop „The Food of Sichuan“
With a sharp knife, make a slit lengthwise down the back of each shrimp, through the thickest part. Place in a bowl, add the marinade ingredients and refrigerate, preferably for a few hours.
Snip the chilies in half or into ¾-inch (2cm) sections and shake out the seeds. Cut the scallion whites into ½-inch (1cm) slices.
Cut the celery at an angle into diamond shapes. Combine the sauce ingredients with 1½ tbsp cold water in a small bowl.
Heat the oil in a seasoned wok to 300°F (150°C) (hot enough to produce a notable, though not violent, sizzle around a test shrimp).
Add the shrimp, separating them with long cooking chopsticks or tongs, then add the celery. When the shrimp are half-cooked remove them and the celery with a slotted spoon and set aside.
Carefully pour off all but about 3 tbsp of the oil from the wok and return to high heat. Add the chilies and Sichuan pepper and stir-fry briefly until the chilies are fragrant.
Add the garlic, ginger and scallion whites and stir-fry until you can smell them. Tip the shrimp and celery and stir-fry until just cooked (test a shrimp to make sure).
Give the sauce a stir, pour into the wok and stir as the sauce thickens and coats the shrimp. Finally, stir in the cashews and serve.
