What do you fry an egg in?

An egg should be fried until the white has just set, and the yolk is still runny. It's best to slightly under cook and the yolk should remain on top and in one piece.

But what fat do you put in the pan? Personally, I think anything other than butter is an abomination, and they should be fried gently on a low heat.
What do you fry an egg in?
What do you fry an egg in?
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