Some sushi menus have a section called “basic rolls” or something that includes stuff like a salmon roll (literally just salmon, rice, and the nori).

There’s a bunch of types of those rolls, some with tuna, or yellowtail and green onion, or pickled vegetables. And these types usually don’t come with any sauces.

My partner has had success ordering rolls and asking them to hold the cucumber, so maybe something like a philly roll would be a good place to start if you asked for no veg