I have one tried adn true porter recipe...and its far from 'simple'. I think it uses 5 specialty grains plus the base malt, and two types of hops.
oh heck, I'll share the original extract recipe anyways!
click on this link to get to the recipe. Link will expire at the stroke of Midnight, May 6th, 2008.
Primary: English Mild
On tap: Pale Ale, Lancelot's Wheat, English Brown Ale, Steam Beer, HoovNuts IPA
Bottled: MOAM, Braggot, Raspberry Melomel, Merlot, Apfelwein, Pyment, Sweet mead, Cabernet
Gal in 2009: 27, Gal in 2010: 34, Gal in 2011: 13, Gal in 2012: 10