Tofu Subs with Onions and Peppers

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1 small onion, halved and thinly sliced 

2 bell peppers (1 red, 1 green), thinly sliced 

3 tablespoons extra-virgin olive oil

Kosher salt

1/2 teaspoon red pepper flakes

1 teaspoon fennel seeds, crushed

10 ounces extra-firm tofu, sliced into 8 pieces and patted dry

4 whole-wheat sub rolls, split

1/3 cup marinara sauce, warmed

2 tablespoons balsamic vinegar

Freshly ground pepper

6 cups baby arugula

1 ounce parmesan cheese, shaved with a vegetable peeler