This video shows how to cut tofu in four different ways, just in case you don't like triangles. You can also do it this way: 1. Cut the tofu block vertically into 2 thick slices. 2. Then, cut through the center of these so that you have 4 thick blocks. 3. Turn each block on its end and cut through it diagonally - making two long triangular shapes. 4. Slice each of the two long triangular shapes into 1/4" thick slices. Repeat for the other 3 blocks. Alternatively, you can rip the tofu into chunks that resemble pieces of chicken, so the finished dish will look very similar to sweet and sour chicken.