What do they inject into bacon?

Chef's answer
Water is widely injected into bacon by many UK producers, as it provides a solution that allows for even distribution of curing salts (principally sodium chloride) added to the meat.
Frequently asked Questions 🎓
No, there isn't actual butter in Butterball turkeys It's okay if you've asked yourself if Butterball turkeys actually contain butter. It makes sense, because the word butter is in the name after all. And generally speaking, butter makes everything taste better.
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