Crispy Jerusalem Artichokes with Aged Balsamic

Heat oil in a large skillet, preferably cast iron (you'll need a lid), over mediumhigh heat. Add Jerusalem artichokes and 1/4 cup water and season with salt and pepper. Cover and cook, stirring occasionally, until Jerusalem artichokes are fork-tender, 8 –10 minutes. Uncover skillet and cook, stirring occasionally, until water is evaporated and Jerusalem artichokes begin to brown and crisp, 8 –10 minutes longer; transfer to a platter. Add rosemary and butter to skillet and cook, stirring often, until butter foams, then browns, about 4 minutes. Remove skillet from heat and stir in vinegar, scraping up any browned bits. Spoon brown butter sauce and rosemary over Jerusalem artichokes.