3½ cups cooked short-grain brown rice
2 tablespoons pure maple syrup
1 tablespoon brown rice vinegar
¼ teaspoon sea salt (optional)
1 medium Persian cucumber, cut into ¼-inch sticks
1 medium red bell pepper, cut into ¼-inch strips
1 medium carrot, cut into ¼-inch sticks
1 avocado, thinly sliced
4 nori sheets
Low-sodium tamari or soy sauce for serving
Wasabi paste, for serving