Start by mixing soy sauce, rice vinegar, hoisin sauce, sugar, and red pepper flakes in a bowl.
Set this aside for later.
In a separate bowl, blend the cornstarch with water.
Set this aside too.
Heat the vegetable oil in a large skillet or wok over medium-high heat.
Add the shrimp and stir-fry for about 2 minutes until pink.
Remove shrimp and set aside.
In the same skillet, add bell pepper, peanuts, green onions, and garlic.
Stir-fry until the veggies are tender.
Return shrimp to the skillet and pour the soy sauce mixture over everything.
Stir in the cornstarch mixture and cook until the sauce thickens.
Enjoy your dish served on a bed of rice!