Per Wikipedia....
Coal butterAround the 1930s and 1940s, Arthur Imhausen developed and implemented an industrial process in Germany for producing edible fats by oxidizing synthetic paraffin wax made from coal.[17] The products were fractionally distilled and the edible fats were obtained from the C 9-C 16 fraction[18] which were reacted with glycerol such as that synthesized from propylene.[19] Margarine made from them was found to be nutritious and of agreeable taste, and it was incorporated into diets contributing as much as 700 calories per day.[20][21] The process required at least 60 kg of coal per kg of synthetic butter.[19] That industrial process was discontinued after WWII due to its inefficiency.
Nasty yo….. 🤮