Look at the fat content. You will see the fat content listed as a ratio of lean/fat, such as 90/10, 80/20, 70/30. Ground beef that has a 80/20 fat content would have 80% lean meat and 20% fat. Keep in mind that fat, from other animals, may be added to the lean meat. This is more likely to happen with 70/30 beef. A 90/10 fat content will not usually have fat added and will not have much fat in the pan after you fry up burgers.
Burger night!
Start with really good ground beef, add a vegetable, and you have a great supper.
Burgers
1 lb ground beef
Form into 4 or 5 patties. Cook in a skillet to desired doneness.
Green Beans
Retrieve canned or frozen green beans from pantry or freezer. Reheat.