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So the Wine Geek Question of the Day:
Ruby Cabernet was developed as a cross and was produced extensively for a while in California, although it has now fallen out of favor.
Ruby Cabernet is a cross of Cabernet Sauvignon and what other grape variety?
BONUS for Supergeeks: One of California's most renowned wineries prominently features an old vine version of this other grape variety in one of its legndary releases. Name that winery.