Prep the tofu: Cut the tofu in half horizontally into two large slices. Take one of the tofu pieces and place a chop stick on either side of the tofu to stop from cutting all the way through so the slices remain intact. Slice the tofu part way through repeatedly about ⅛" apart to give the tofu a flaky texture. Repeat with the other tofu slice.
Make the marinade: add the nori, vegetable broth, lemon juice, miso paste, Old Bay, garlic powder, and salt to a blender. Blend until smooth. If you don't have a blender you can chop the nori very finely then whisk everything together in a large bowl. This will make a very ugly greenish-brown marinade. Place the tofu in a resealable bag or dish and cover with the marinade. Let marinated in the fridge for a minimum of 30 minutes or as long as overnight.
Cook the tofu fillets: In a large skillet or non-stick frying pan, heat the oil or butter. When hot add the tofu fillets to the pan, discarding any leftover marinade. Fry for 3 - 5 minutes per side until the tofu is golden brown and heated through. Be very careful when flipping the tofu as it's very tender. Serve the hot tofu fillets with parsley and black pepper and a generous squeeze of fresh lemon.
