Ground beef starts as larger cuts and trimmings from a beef carcass, which are then put through a series of grinding, blending, and packaging steps. The process is more deliberate than most people assume, with specific cuts chosen and blended to hit a target fat percentage before the meat ever reaches a store shelf.
Where the Meat Comes From
A whole beef carcass gets broken down into large sections called primals: the chuck (shoulder), round (rear leg), sirloin, and others. As butchers cut these primals into steaks and roasts, they generate small pieces of lean meat and fat called trimmings. These trimmings have historically been the primary raw material for ground beef. Today, processors also grind whole cuts or subprimals depending on the product they’re making.
The label on the package tells you something about what’s inside. Ground chuck can only contain meat and fat from the chuck primal. Ground round comes exclusively from the round, and ground sirloin from the sirloin. A package labeled simply “ground beef” can be a blend of any primal cuts and their trimmings. Many shoppers assume ground round is the leanest option, followed by ground sirloin and then ground chuck, though the actual lean-to-fat ratio printed on the label is more reliable than the cut name alone.
There’s also a legal distinction between “ground beef” and “hamburger.” Beef fat from other parts of the carcass can be added to hamburger but not to ground beef. Both are capped at 30% fat maximum, and neither can contain water, fillers, or binders.
How the Grinding Process Works
At a processing plant, the first step is fabrication: workers break the carcass into primals and trim away bone, heavy connective tissue, and surface material. The resulting lean meat and fat trimmings are sorted and weighed to create batches with a target fat ratio, typically somewhere between 73/27 (73% lean, 27% fat) and 93/7 depending on the product.
The meat then goes through an industrial grinder, which uses a rotating auger to push chunks of beef through a metal plate with holes of a specific diameter. For a coarse grind, the plate holes are about a quarter inch across. For the finer texture you see in most retail ground beef and hamburger, the plate holes are around an eighth of an inch. Many processors do two passes: a coarse grind first to break things down, then a fine grind to reach the final texture. Between or after these grinding stages, the meat is blended to make sure the lean and fat are distributed evenly throughout the batch.
Temperature control matters throughout this process. Friction from grinding generates heat, and warmer meat is more hospitable to bacteria. Processors keep the meat cold, often working with partially frozen trimmings, to maintain both safety and texture. Warmer fat smears rather than cutting cleanly, which can make the final product feel greasy.
Lean Finely Textured Beef
Some ground beef contains a component called lean finely textured beef, or LFTB. This is lean meat recovered from fatty trimmings that would otherwise be difficult to separate by hand. The trimmings, typically about 50% lean, are heated at a low temperature and then spun in a centrifuge to separate the fat from the protein. The result is an exceptionally lean product, between 94% and 97% lean beef, which gets frozen rapidly into thin sheets and shipped to processors who blend it into ground beef.
LFTB became controversial in 2012 when critics called it “pink slime,” and several major grocery chains stopped selling beef containing it. The USDA maintained that the product is safe, and it remains approved for use. Part of the production process involves treating the beef with a small amount of food-grade ammonia gas, which raises the pH and reduces harmful bacteria. Whether a given package of ground beef contains LFTB isn’t always obvious from the label, though some retailers have voluntarily disclosed its presence or absence.
Safety Steps Before and During Grinding
Ground beef carries higher food safety stakes than whole cuts. A steak only has bacteria on its outer surface, which gets killed the moment it hits a hot pan. Grinding mixes that surface throughout the meat, so any contamination that was on the outside is now on the inside too. This is why ground beef requires more aggressive safety interventions.
Before grinding even begins, beef carcasses are treated to reduce pathogens. Common interventions include spraying or dipping carcasses in organic acid solutions like lactic acid, rinsing with hot water, or applying acidified sodium chlorite. These treatments happen after slaughter and again before fabrication, layering multiple barriers against bacteria like E. coli and Salmonella. Using organic acid rinses on chilled carcasses before they’re cut into primals provides an additional layer of protection beyond what earlier treatments achieve.
Once the meat is ground, processors test batches regularly for pathogens. USDA inspectors are present in processing plants, and facilities operate under food safety plans that identify every point in production where contamination could occur and specify how to prevent it.
Packaging That Affects Color and Shelf Life
The bright red color of ground beef in a store display case isn’t an accident. It’s largely a function of how the meat is packaged. Traditional foam trays with plastic overwrap allow oxygen to reach the meat’s surface, which reacts with a pigment in the muscle to produce that familiar red. This method keeps the color appealing for about two to three days.
Many processors now use modified atmosphere packaging, or MAP, which replaces the air inside a sealed package with a specific blend of gases. Three gases do the heavy lifting. Oxygen promotes and maintains the red color consumers expect. Carbon dioxide inhibits bacterial growth, extending shelf life. Nitrogen acts as a filler to keep the package from collapsing, since meat tissue absorbs carbon dioxide over time. A typical blend might be around 30% oxygen, 20% carbon dioxide, and 50% nitrogen, though the exact ratios vary by manufacturer and product.
You may have also seen ground beef sold in sealed tubes, sometimes called “chubs.” These are filled in oxygen-free environments, which is why the meat inside often looks purplish rather than red. That color is normal. Once you open the package and expose the meat to air, it turns red within about 15 to 20 minutes.
From Plant to Store
Large-scale ground beef production happens at centralized processing plants that ship to grocery distribution centers across the country. Some ground beef, though, is still ground in-store. Grocery store butchers receive whole primals or subprimals and grind them on site, which is why you’ll sometimes see “ground in store” on a label. The process is identical in principle, just smaller in scale, using the same type of auger-and-plate grinder.
The fat percentage printed on the package is the single most important number for cooking. An 80/20 blend (80% lean, 20% fat) is the most common all-purpose grind, with enough fat to stay juicy in burgers but not so much that it shrinks dramatically. Leaner grinds like 90/10 or 93/7 work better in dishes like chili or tacos where you’re draining fat anyway. Fattier grinds around 73/27 are the cheapest option and shrink the most during cooking, but they deliver rich flavor when the fat is managed well.