By Lenn Thompson, Executive Editor I've enjoyed winemaker Osprey's Dominion Vineyards winemaker Adam Suprenant's cabernet franc for as long as I've been drinking Long Island wines. Even in the so-called lesser years, it's one of my favorites. At $20, it's also one of the best values in local franc. Chocolate-covered cherries come to mind on the nose along with ripe black raspberries, rubbed sage, dried cherries and a little oak. Medium-to-full bodied, the palate is extremely ripe — edging on too ripe — with blackberries and black raspberries leading the way. A sprinkling of herbs — sage and thyme —…