Prep your ingredients: In a small bowl, whisk together the soy sauce, rice vinegar, red pepper flakes, water, and cornstarch. Set aside.
Cook the shrimp: Heat the olive oil in a large skillet or wok over medium-high heat. Add the shrimp and cook until pink and cooked through, about 2-3 minutes. Remove from the skillet and set aside.
Sauté the vegetables: Add the onion and red bell pepper to the skillet and cook until softened, about 3-4 minutes. Stir in the garlic and cook for an additional 30 seconds.
Combine and thicken: Return the shrimp to the skillet and pour in the sauce mixture. Bring to a boil, then reduce heat and simmer until the sauce has thickened, about 1-2 minutes.
Serve: Serve immediately over rice or noodles.
Tips:
For a more flavorful shrimp, marinate it in a mixture of soy sauce, rice vinegar, and ginger for at least 30 minutes before cooking.
Feel free to add other vegetables to this dish, such as broccoli, carrots, or snow peas.
For a spicier stir-fry, add more red pepper flakes or a pinch of cayenne pepper.