Happy #MerlotThursday, which is also Thanksgiving Day! Today, I’m grateful for three things: Merlot, Australia’s McLaren Vale region, and those generous locker-holders at the wine club who are willing to pour you exquisite samples. A rare single-vineyard Merlot was on the tasting table, the 2023 Hickinbotham “Revivalist.” After decades of supplying dry-farmed grapes for some…