If you are using crushed pineapple in a can, there is literally no chopping or processing required in making this fruit topping. You can simply drain the syrup and proceed with cooking the fruit. If you are using fresh or canned pineapple cubes or rings, the easiest way to chop the fruit is by using a food processor. Place your fruits in the processor and use the pulse function to crush and chop the fruit into small chunks. You can also choose to chop the pineapple by hand. This can take a bit of time, but it is definitely an option. Slice and chop the fruit into small chunks. Another way is to grate the pineapple with a vegetable or cheese grater. This is best for fresh pineapple as you need the fruit to be a little firm for easy grating. Also, if you use this method, cut the pineapple into long wedges for easy holding when grating.