Question: Grignolino, is a red Italian wine grape variety, commonly grown in the Piedmont region, Grignolino has two "Denominazione di origine controllata" (DOCs) that produce wine from it, Monferrato Casale and Asti, also known as Asti Spumante, is a sparkling white Italian wine that is produced throughout southeastern Piedmont but is particularly focused, around which two towns?
Sentence (from "Asti wine"): In fact, on an average vintage more than ten times as much Asti is produced in Piedmont than the more well-known Piedmontese red wine Barolo.
Relevant evidence: No