For Bas de Groot, cow’s milk is more than an accompaniment to cereal—it’s a liquid of serious complexity akin to a fine wine. This milk sommelier treats each taste like a sensory experience worthy of discernment and “terroir” exploration. We caught up with de Groot as he traveled to Sonoma, the heart of California’s wine country, to taste the milk of Clover Sonoma’s Bucher Farms. His tasting notes: “Fresh, sweet, with a long aftertaste.”