From : Chinese cooking demystifyied
Peel the shrimp
Butterfly (or slice in half lengthwise) and remove the veins.
Rinse, then submerge the shrimp and mix in the ½ tsp sodium carbonate. Let sit for 10 minutes.
Rinse and soak in water for 3 minutes under running water.
Drain the shrimp by transferring them to paper towels. Lightly squeeze out excess liquid. Move over to a rag or kitchen towel and roll it up to finish drying. Transfer to a bowl
Marinate : Add cornstarch, salt, sugar, white pepper and sanding wine, and mix well. Set aside for 2 to up to 30 minutes
Pass through oil: add enough oil to be about to barely submerge the shrimp (¾ cup to 1 cup in our wok). Heat oil to 160C. , then drop the shrimp in. Fry until cooked, 30-40 seconds. Remove and drain the excess oil
If passing through water, let the water come to a heavy simmer/light boil. Drop the shrimp in and don't disturb for 20 seconds, then spread evenly and boil until cooked through (about 40 more seconds)
Peel the celery, then cut on a bias into ~two inch sections
Toss wok with about 1.5 tbsp oil, set to the celery for about 45 seconds over a medium high flame. Add in the shrimp and give it a quick stir.
Scoop the flame to low, add in the seasoning sauce. Once it's thickened and clinging to everything, fold off. Drizzle in a teaspoon of the shrimp frying oil for sheen
