Marinated Tofu: Mix tamari, 1 teaspoon sesame oil, and sriracha sauce. Slice tofu into 6 long strips. Place in the marinade. Marinate for at least an hour.
Spread 1 tablespoon sesame oil on a hot pan. Place tofu slices on pan. Cook over medium heat until golden brown on both sides.
Pickled Carrots: Mix brown rice vinegar and sugar. Either let sit until sugar dissolves, or heat on stovetop or in microwave to dissolve faster. Place julienned carrot in mixture. Let sit overnight.
Sriracha Mayo: Mix all ingredients.
Sandwiches: For a better bun to filling ratio, scoop out some of the bread - especially the top bun if it's larger than the bottom bun. Slather sriracha mayo on buns. Layer tofu, sliced cucumber, pickled carrots, cilantro, and jalapeño on top.
*If you like to slather both pieces of bread with sriracha mayo, you'll want to double the sriracha mayo recipe.