Remove the tofu block from the package and drain the excess liquid.
Very lightly pat the block dry and gently press to remove any more moisture.
With a sharp knife, cut the block into even-sized ½ inch cubes.
Pat dry once more with a paper towel and add all of the cubes to a large mixing bowl
In a measuring glass or a small mixing bowl, add 6 tablespoons of vegan mayonnaise.
Mix in the black salt, turmeric powder, paprika, onion powder, and salt until well combined and pale yellow in color.
If necessary (mixture is too thick) add a splash (1 tablespoon) of water and mix.
Use a rubber spatula and pour/scrape the mayo mixture into the bowl of tofu
Gently mix the mayonnaise mixture into the tofu until well combined. Try to keep the cube shapes intact, but don't worry if they break apart
Scoop a generous amount onto a slice of bread. Top with another slice of bread and cut down the middle with a very sharp knife