Pat the shrimp very dry. In a bowl, toss the shrimp with cornstarch to coat.: You will notice the shrimp go from slightly glossy to a matte, lightly dusted finish, which helps them brown. As the shrimp hit the hot pan you should hear a confident sizzle, and that brief sear locks in juices while the starch creates a thin barrier so the glaze clings later. If the shrimp are wet, they will steam rather than brown, so pat them thoroughly and avoid overcrowding the bowl when tossing with the cornstarch . A common mistake is skimping on drying, which leads to pale, soft shrimp instead of the appealing caramelization you want.
Heat a wok or large saute pan over high heat. When hot, swirl in just 1 tablespoon of the cooking oil. Add the shrimp to the pan, trying not to overlap. Let cook for 30 seconds. Flip, and cook an 30 seconds. Remove the shrimp to a clean bowl. The shrimp will be half-cooked, we will finish cooking in a later step.: As the pan heats, it should shimmer and the oil will thin, indicating it is ready. When the first shrimp batch hits, listen for a sharp sizzle and look for tiny edges turning opaque and gold. Cooking briefly on both sides gives a seared exterior while keeping the center slightly translucent so it will not overcook in the final sauce stage. If you crowd the pan you will trap steam and lose that sear, so work in a single layer. Watch closely since shrimp cook extremely fast and can turn rubbery if left too long.
Turn the heat to medium-high. To the same pan, swirl in the remaining cooking oil. When hot, add in the onion and bell pepper. Stir fry for 1 minute. Add in the sugar snap peas and continue to stir fry for an additional minute.: The vegetables should hit the pan and immediately begin to sing with a bright hiss as they make contact. You want them to soften slightly while keeping their vibrant color and crispness, so use quick, continuous motion to expose faces to the heat. The onion will begin to sweeten, and the bell pepper will show softened edges and glossy skin. Adding the snap peas second ensures nothing overcooks. A common misstep is leaving the vegetables too long, yielding limp, dull pieces instead of the lively crunch that contrasts with the shrimp .
Add in the half-cooked shrimp and pour in the Ginger Teriyaki Sauce. Cook until the sauce comes to a simmer, thickens, and is glossy. Garnish with green onions.: As the sauce hits the hot pan it will steam and release fragrance from the ginger and soy sauce . Stir to coat everything evenly, and watch for the sauce to change from a watery sheen to a syrupy, glossy film that clings to the shrimp and vegetables. You will hear gentle bubbling as it reduces, and smell the melding of sweet and savory. This is when the flavor concentrates, so be patient and let it reach that glaze stage, then remove from heat to avoid over reducing. A frequent error is turning the heat too high and scorching the sauce, which gives a bitter finish instead of the balanced glaze you want.