Make the sauce. In a small bowl, whisk together soy sauce, honey, minced garlic, grated ginger, rice vinegar, and sesame oil.
In another small cup, stir cornstarch into the broth or water until smooth. Set both aside.
Prep the shrimp and veggies. Pat shrimp very dry with paper towels and season lightly with salt and pepper. Cut vegetables into bite-size pieces so they cook evenly.
Stir-fry the vegetables. Heat the neutral oil in a large skillet or wok over medium-high heat until shimmering.
Add the vegetables with a pinch of salt and cook, stirring often, 3–4 minutes until crisp-tender. Transfer to a plate.
Cook the shrimp. In the same pan over high heat, add the shrimp in a single layer. Cook 1–2 minutes per side until pink and just opaque.
Do not overcook. Return the vegetables to the pan.
Add the sauce. Pour the honey-garlic mixture over the shrimp and veggies. Stir to coat.
Give the cornstarch slurry a quick stir and add it to the pan. Cook 30–60 seconds, stirring, until the sauce thickens and turns glossy.
Adjust and finish. Sprinkle in red pepper flakes if using. Taste and adjust with a splash more soy sauce for savory depth, honey for sweetness, or vinegar for brightness.
Remove from heat.
Garnish and serve. Top with green onions and sesame seeds. Serve immediately over warm rice or noodles.