Web Reference: Also, the onions would express water, which would lower the temperature to simmer or steam, preventing the beef from browning. For these reasons, it is common to sear or brown the ground (minced) meat, and then add the onions to cook through when it is done or nearly done. I assume that the section of the USDA article you're referring to is this: Partial Cooking Never brown or partially cook beef to refrigerate and finish cooking later because any bacteria present wouldn't have been destroyed. It is safe to partially pre-cook or microwave beef immediately before transferring it to the hot grill to finish cooking. Before I go on, I should point out that the USDA ... Regardless what color the beef is, two weeks is entirely too long to refrigerate ground beef. It is unsafe and should be thrown out. Raw ground beef only keeps in the refrigerator for 1-2 days. Ignoring storage time, regarding color, brown meat is as safe to eat as red meat. As others have indicated it is simply oxidation occurring.
YouTube Excerpt: Cooking ground beef
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