Mix all the corn starch and vermouth in a large bowl, then add the shrimp. Toss to coat. Let sit for 15 minutes.
Heat a wok over high heat for 1 minute. Add the oil and let it get hot, about 30 seconds. Add the ginger and garlic and toss to combine. Stir-fry for about 30 seconds.
Add the shrimp and all the marinade to the pan (scrape out all the marinade with a rubber spatula). Add the snow peas, soy sauce, hoisin sauce and chicken stock. Stir-fry until the shrimp turns pink, about 2 minutes. Add the green onions and stir-fry 1 more minute. Turn off the heat and add the sesame oil. Toss to combine once more and serve with steamed rice.