Start by mixing together all the ingredients for the tahini marinade. You can adjust the amount of sriracha and liquid sweetener to make it sweeter or more spicy.
Then, add roughly ¼ cup of water in total, one tablespoon at a time. The marinade should have a runny consistency.
Place the sunflower seeds in a food processor and pulse a few times until crumbly. Add salt and pepper.
Cut the tofu into sticks or cubes or slices or any shape you like.
Dip each piece in the marinade and coat evenly, shake to remove any excess marinade.
Sprinkle some sunflower seed crumbles on all sides and place on a lined baking tray.
Bake in the oven at 180-200C for 20-25 minutes, flipping after 20 minutes.