I recently spent an enjoyable moment not at a conventional winery dinner, but at what ended up being a remarkably coherent tasting journey (even though, yes, it was a dinner). The evening’s journey began with wines from different denominations and grape varieties across Piemonte, gradually narrowing its focus to Nebbiolo, and ultimately arriving at three cru wines (what are referred to officially as Menzioni Geografiche Aggiuntive or MGAs, but are for all intents and purposes large vineyard districts)—Coste di Rose, Cannubi and Sarmassa—from the same 2019 vintage and the same commune of Barolo.