FARRO RISOTTO WITH SWEET CORN AND TOMATOES

Steps:

• Using a sharp knife, cut the corn kernels off the cob, cutting as close to the cob as possible. Set the kernels aside and reserve the cobs.
• Make the corn stock: Holding the cobs over a medium saucepan, use a spoon to scrape down the sides of the cobs to release any additional corn and juices. Break the cobs in half and add to the saucepan, along with 8 cups water and 1 teaspoon salt. Bring to a boil, lower the heat, and simmer for 15 minutes before starting the risotto. (Keep the stock and corn cobs simmering while you cook the risotto.)
• While the corn stock simmers, heat the oil and butter in a separate pot or Dutch oven over medium-low heat. Add the leeks and sauté until tender, 5 to 7 minutes. Add the farro and stir for 1 minute. Add the white wine and simmer until most of the liquid has evaporated.
• Increase the heat to medium and gradually add the corn stock, about 1 cup at a time, to the farro mixture. Cook, stirring occasionally, and adding more stock as the farro absorbs it.
• When the risotto has been cooking for 15 minutes, add the tomatoes, corn kernels, 1 teaspoon salt and 1/2 teaspoon pepper. Continue cooking, adding stock as necessary and stirring often, until the farro is tender, 10 to 15 more minutes. (You will use most - if not all - of the corn stock.) The risotto is done when the farro grains are tender and most of the liquid has been absorbed.
• Off the heat, stir in the Parmesan, tarragon and lemon zest. Season to taste with salt and pepper and serve immediately.