True prosciutto is one of many Italian delicacies, especially that from Parma region, a kind of air-dried bacon that melts on your tongue. As common for bacon, it has small parts of fat. In the context here, "Speck" is the German term for the fat in cured bacon that makes the delicacy even smoother. You can buy the original prosciutto at high-end deli shops in the U.S., including the west coast (nothing but the finest for them, ever). IMHO, even steadfast vegetarians would savor it.
Now, horror of horrors, a "veggie version" prosciutto may be coming to your local deli soon. This novel delicacy is not to excite your taste buds with new impressions, oh no, not at all. Its sole raison d'etre is to save the world from the climate Armageddon (supposedly) approaching at a meteoric speed and its (claimed) cause: rising CO2 levels in the atmosphere resulting from mankind's meat consumption, etc.