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Just guessing here, but I wonder if it would be good in refried beans? Or, if not, to use when cooking dried beans (I always use a dollop or drizzle of some kind of fat, olive oil, lard, etc). Is it salted?
Oxtail fat = beef fat = suet. This is a treasured source of nourishing fat, very flavorful, use it it make a crust for a beefy empanada (or other beefy) pie. If you are feeling generous toward nature, suet is often used for birdfeeders too!
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