Winemaker Mike Sinor is the SLO Coast Champagne Renegade. Instead of focusing on traditional-method sparklers, he takes interesting varieties and the older, pared-down and simple, ancestrale method instead. Pétillant Naturel, or Pét-Nat, is an even more ancient way to make sparkling wine than the widely-used méthod traditionelle or méthod champenoise originated in Champagne, France. In …