Step 1: Undercook it like you mean it. This is the most important step in the process. You can't have undercooked pasta without a good undercook.
Step 2: Add a side of hair dryer. This will add an extra layer of complexity to your dish. Just make sure to set the dryer to 'cool' or you might end up with a crispy pasta.
Need more help? Visit our Toaster Companion page or our Salt and Outrage page for more information.
Or, if you're feeling adventurous, try our Washing Machine Experiment page.