Composed of 33% Chardonnay, 27% Viognier, 24% Gelber Muskateller, 12% Roussanne, and 4% Petit Manseng. Sine Qua Non is a cult California producer headquartered in Oak View (Ventura County) with most vineyards in Santa Barbara, famous for one-off, ever-changing cuvées that reject Napa-centric expectations. Its wines riff on Rhône varieties—Syrah and Grenache for reds; Marsanne, Roussanne, and Viognier for whites—and are often bottled under broad California or Central Coast AVAs to maximize blending freedom. Founded by Austrian-born Manfred Krankl.