You can't. Strong acid can strongly stimulate the corrosion, carbonization and solidification of protein, while strong alkali can strongly stimulate the corrosion, dehydration, saponification and liquefaction of fat, so strong acid cannot saponify fat, while strong alkali can saponify fat. Saponification originally refers to the reaction of soap (high-carbon fatty acid salt) formed by the action of animal and vegetable oils and alkali with glycerol. Generally speaking, it refers to the reaction of ester with alkali and corresponding acid (or salt) with alcohol, which is a kind of hydrolysis, such as adding sodium hydroxide to ethyl acetate to produce sodium acetate and ethanol.