First up, go find a little piggy and kill it. This will give you raw pork.
Next, you'll need a furnace; this is how you make one and get an achievement at the same time:
Next, you need fuel to cook the chop.
Open the furnace
and drop a block of wood (not planks) on the Input and Fuel and wait, this will give you charcoal. Double click the Result to move the charcoal to inventory.
Now place the pork chop on Input and the charcoal on the Fuel.
Now you have some cooked pork, equip it (like an ax) and then hold down right mouse button to munch on it.