Thanks to the locavore movement, we’re used to food with origin stories: that venison tartare once ran free in a forest in Katonah. But what about the farmers? They started out somewhere, too. On a recent Saturday morning, eighteen fledgling farmers gathered in the East Village, armed with PowerPoint presentations and big dreams. They were the latest graduates of the Farm Beginnings class run by GrowNYC, which also oversees more than fifty farmers’ markets in New York City, including the huge one in Union Square.