The easy, ultra flavorful, and very thick homemade teriyaki sauce literally takes less than 5 minutes to make and it's so good. You will likely have extra sauce that you can use for serving or save it in the fridge for weeks. However, if you are short on time or are feeling a little lazy, I'm sure that you could use store-bought teriyaki sauce. I would make a mixture of half store-bought hoisin sauce and half-store bought teriyaki sauce if you're going the store bought route for proper viscosity. Pure teriyaki I think would be too runny and thin.