Pressing the liquid out of the tofu block is a very important step to get a crispy exterior on your tofu cubes. You can use any type of starch you have on hand like potato or rice. Here are substitution ideas for mirin and sake. The teriyaki sauce will start out very thin and it will thicken the longer it cooks. Once your teriyaki sauce begins to bubble, that is when you know it is close to being ready.