Grass-fed beef will be tough and chewy if cooked to the usual USDA temperatures most of us are used to. The USDA recommends the beef be cooked to 145 - 170°F, while 120 - 140°F is best for pastured or grass-fed beef. Shannon Hayes at www.grassfedcooking.com has taught me the most about bringing the rich and delicious flavors from these meats!
Adapted from Saveur Magazine #163