"Plin" are a typical product of Piedmont, especially in the western Piedmont.
In the Piedmontese dialect, "Plin" is the pinch, this term derives from the name of this egg pasta filled with roast meat, plin is the pinch that is given to the pasta.
The Plin are cooked in boiling water and served with butter and sage sauce, or roast. But to fully appreciate the taste, tradition has it that you may taste on a napkin with no seasoning.
During the demonstration Gustadom in Asti you can taste the agnolotti Gobbi served in this way.