To make the juiciest, most flavorful burgers, choose ground beef that is 70 percent lean and 30 percent fat. To make more healthful burgers—but ones that are still pretty juicy and tasty—choose ground beef that is 80 percent lean and 20 percent fat. Ground beef that contains less than 15 percent fat makes dry and somewhat tasteless burgers. To see what the lean-to-fat ratio is on ground beef packages, look on the label. The ratio will usually appear in slashed numbers, with the lean content before the slash and the fat content after the slash—such as 70/30, 80/20, and so on.