As someone who can't eat butter, 99% of the time you can make this move with a neutral-tasting cooking oil. Some folks are in love with how butter changes a dish's flavor or richness, but there are many other ways to add fatty acids and glutamates to food. So it really is kind of bullshit - save time and reach for the vegetable oil.

The only exception are dishes that need the cooking fat to solidify in the fridge. Coconut oil and lard (suet too - but who has that?!) can work for those uses, but think ahead and beware of your melting points. You don't want to deliver an oily mess of food to a friend's house because it was warm out.

[–] phiresky@lemmy.world 1 points 1 year ago

Remember though that butter is only 80% fat. Especially relevant for baking recipes where you have a ton of butter and if you replace that can make it denser and greasier. E.g. 200g butter you should replace with ~160g oil and 40ml water.