Cut the block of tofu in half to form 2 equally sized rectangles.
Cut into the top of the tofu at a diagonal, keeping the knife at a 90 degree angle to the cutting surface, Stop the knife 1-2 cm away from the bottom. (you can use a kitchen utensil as a guideto make sure you don't cut all the way through) Cut along the entire length of the tofu, as pictured.
Repeat for both fillets then add to a sealable container.
Pour over half the marinade. Add the other half of the marinade with a spoon, prizing apart the layers and pushing the marinade into the crevices of the tofu fish.
Add the lid to the container and marinate in the fridge for at least a few hours, or up to 3 days.