I don't think I'm interested in doing anything to support this, but I'll put out some URLs for those who might be.

Visiting workshed:

campground.php?action=workshed

Adding ingredients is all Javascript stuff. Once you have added four ingredients:

campground.php?action=makepizza&pizza=4950%2C9428% 2C617%2C9420

%2C is the url_encoded representation of a "," So, that would be:

visit_url( "campground.php?action=makepizza&pizza=4950,9428,6 17,9420" )

4950 = abominable blubber
9428 = alien animal goo
617 = Angry Farmer candy
9420 = alien plant goo

You acquire an item: medicinal candy farmer and alien plant pizza

Code:
Unknown item found: medicinal candy farmer and alien plant pizza (10336, 820781574)
--------------------
10336	medicinal candy farmer and alien plant pizza	820781574	horadricpizza.gif	food	q	0
medicinal candy farmer and alien plant pizza	3	1		0	0	0	0	Unspaded
# Item medicinal candy farmer and alien plant pizza: (</font><font color=green>?</font><font color=red>?</font><font color=#999999>?</font><font color=blue>)
Item	medicinal candy farmer and alien plant pizza	Lasts Until Rollover, Effect: "Angry like the Wolf", Effect Duration: 15
--------------------
From a different character:

Code:
> test newitem 820781574

--------------------
10336	diabolic pizza	820781574	horadricpizza.gif	food	q	0
diabolic pizza	3	1		0	0	0	0	Unspaded
# Item diabolic pizza: (</font><font color=green>?</font><font color=red>?</font><font color=#999999>?</font><font color=blue>)
Item	diabolic pizza	Lasts Until Rollover
--------------------
That color coding for food quality is weird:

Code:
Type: <b>food <font color=blue>(</font><font color=green>?</font><font color=red>?</font><font color=#999999>?</font><font color=blue>)</font></b>
Type: food (???)