1 package firm/extra firm tofu
a few tablespoons canola/vegetable oil
paper towels or lintless towels or some sort
I've done this with medium tofu but it didn't work quite as well - it breaks apart much easier. You can also use a different sort of oil if you like - just make sure it has a high smoke point!
You'll need the towels for drying the tofu - I've used cloth towels before and it works great. Just make sure whatever you're using won't leave part of itself on the tofu.