Which grilled veggies are specified for the Teriyaki sandwich?

The correct choice of grilled veggies for the Teriyaki sandwich is specified as mushrooms and onions. These ingredients are often favored in Teriyaki preparations due to their flavors; mushrooms add an earthy richness while onions provide a sweet and savory contrast when grilled. This combination enhances the overall flavor profile of the sandwich, complementing the Teriyaki sauce, which is typically sweet and savory itself.

Grilled mushrooms and onions are commonly used in various Asian-inspired dishes, making them a fitting choice for a Teriyaki sandwich. The smoky char from grilling also adds depth to the dish, making it more enjoyable. Each of these vegetables contributes to a balanced texture and flavor that pairs well with the Teriyaki elements.

The other options, while they might include vegetables that can be grilled, do not align with the traditional or specified combination for this particular sandwich, hence making them less suitable.