By Lenn Thompson You just can't discuss Long Island sauvignon blanc without a mention of Macari Vineyards in Mattituck. For years they've put out consistently good renditions. In recent years, they've added a second sauvignon with subtle oak influence, but the Katherine's Field is the classic, all-steel edition that I've enjoyed for several years. The Macari Vineyards 2009 Katherine's Field Sauvignon Blanc ($23) is a bit lighter on the nose compared to some other local sauvignon, but is still fresh, grassy and citrusy — particularly showing white grapefruit and a little lime. Lithe and showing more grass-over-grapefruit character, the palate…