Blending – do this at home?

Don't do this at home but the other day I blended a Napa Cab with a Barolo, and enjoyed the results. 

The previous night I had opened a bottle of Elvio Cogno, Vigna Elena Riserva 2006 Barolo for a bordeaux-loving friend who is planning a visit to Barolo this July. It was fine but still pretty tannic – even after four hours in a decanter – and it will doubtless give much more pleasure in six to 12 years. The accompanying wine Giuseppe Rinaldi, Brunate Le Coste 2008 Barolo, his famously illegal blend of two crus (see Battling bureaucracy in...