Why warm meat could cause leaky fat

When you grind beef, all parts of the cut are mixed together. If the meat is too warm, the fat can soften, causing it to blend into the other beef components instead of keeping its shape during the grinding process. This smearing of fat can affect the final outcome of your burger; if the fat loses its structure, it will render out more as the burger cooks. Since a significant portion of a burger's flavor comes from the fat (and you probably want a juicy burger), you want to prevent it from escaping during cooking.
To achieve the best results, ensure that both the meat and the grinder are cold when preparing your mixture. Chill the meat grinder head in the freezer for about 25 minutes before grinding. Cut the cold meat into chunks before grinding, and if the meat takes too long to cut and risks warming up, pop it in the freezer for about 10 minutes before processing it through the grinder.
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