I believe there are restrictions on the movement of meat products:
Quote:
Restrictions of particular interest to international passengers
1. Products of animal origin
Apart from some exceptions the Community rules do not allow the importation of meat, meat products, milk and milk products by travellers.
I wonder if that covers pizza cheese, too?
Found on
THIS SITE.
Hope that helps!
I guess that ignorance is the best defence to adopt, and the worst they'll (probably) do is confiscate your pizza.