Kay Brothers winery, founded in McLaren Vale in 1891 by brothers Herbert and Frederick Kay, is a family-run business with a history spanning over a century. The family diary traces the winery's development through generations of the Kay family, including winemakers Cuthbert 'Cud' Kay, Colin Kay, and now his daughter Elspeth. The winery is known for its traditional winemaking methods, including the use of an original 1928 basket press. It focuses on sustainable, regenerative farming at its Amery vineyard, growing grape varieties like Shiraz and Cabernet Sauvignon. The winery prioritizes biological farming and biodiversity.