Steve, I have to agree with Sal. I would make straight Nebbiolo (Barolo like wine) and Barbera separately. If you want to enhance either wine, add a complementary fruit to the primary fermentation like cherries to the Barbera or cherries and/or prunes to the Nebbiolo. If you insist on blending, make both wines separately and bench test various ratios of the two wines. Good luck and keep us up to date on what you are doing.
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