Have ready a hotel spoon, a work bowl to hold the par-cooked vegetables, a wok or sauté pan with a lid, a small container of water, and your mise tray at the stove.
Stir the step 7 measured water into the cornstarch to make a thick, but pourable slurry.
Place the wok or sauté pan over high heat until very hot. Add a thin film of oil to the wok, then add the kohlrabi and a pinch of salt. Stir-fry, flipping and tossing the kohlrabi, for about 15 seconds. Add about ¼ c water to the wok and quickly put on the lid. Steam the kohlrabi for about 10 seconds, remove the lid and allow any remaining water to evaporate away. Slide the kohlrabi into the work bowl.
If using fresh, raw peas: Return the wok to the heat, add the raw peas (not frozen peas), a pinch of salt, and about ¼ c water. Quickly put on the lid. Pan-steam about 1 minute or until crisp-tender. Remove the lid, evaporate the water away, and then add the peas to the work bowl.
Return the wok to the heat until very hot. Add a film of oil, and then add the snow peas and a pinch of salt. Stir-fry about 20 seconds, and then add them to the work bowl.
Return the wok to the heat until very hot. Stir the shrimp to evenly coat with the marinade. Add about 1 Tbsp oil to the pan and then add the shrimp. Stir-fry about 30 seconds until they turn coral-pink and begin to curl. Add the ginger and garlic and stir-fry about 15 seconds longer.
Slide the par-cooked vegetables into the wok and toss to combine with the shrimp.
Add the shrimp stock or chicken stock and optional hon dashi. Add the Sriracha sauce and sugar, then taste the sauce and, if necessary, balance with salt.
Push the shrimp and vegetables to the side and wait for the sauce liquid to boil. Stir in enough of the slurry to thicken the sauce to a nappé texture (coats the back of a spoon yet flows on a plate).
If using frozen peas: Stir in the peas.