Next door to the Piggery, up in the Finger Lakes, there’s a vegetable farm called Sweet Land that’s been running a CSA through the winter for five years. Shareholders come by their enclosed barn farm-stand in Trumansburg to warm up and pick up carrots, garlic, turnips, squash, potatoes, onions and winter greens every other week. This year, they’re coming to Brooklyn too, at a new locavore-leaning restaurant called Cornerstone at 271 Adelphi, Fort Greene.