Remove the tofu block from the package and set on a cutting board, preferably one with a juice groove to catch the excess water. There will be a fair amount of watery liquid, so have a towel or some paper towels available.
Next, cut the block to 1/2 in square pieces. Cut horizontally through the block in 1/2 in pieces. It should make 3–4 horizontal slices.
Place the slices between a lint free towel or paper towels to soak up the excess water.
Stack them back again to form the original block shape.
Cut down vertically in 1/2 in increments. Then cut the other direction in 1/2 increments to get all 1/2in × 1/2in pieces
Soak up as much water as possible so it doesn’t dilute the mixture coming up.
Label and date the mason jar. or similar sized glass container with tight fitting lid.
In the jar, add the lime juice, onion/garlic blend or nutritional yeast, and miso and blend together thoroughly. Add the tofu squares to the jar, cover with the lid, and invert a few times to coat the tofu squares.
Let marinate in the refrigerator for several hours or overnight before using to allow the tofu cubes to absorb the flavors.
Store in the refrigerator for up to 4 days.