sushe -“How can a S”A not be literal??”
Look it up. One Pshat in the Gemorah explains it like this:
The case is not a woman who burns the supper and takes the burnt food for herself and makes the husband a new portion; nor is it – if she burns the supper and she takes the burnt meal for herself and also serves her husband a burnt meal; but the case is – she burns the supper -this she serves to her husband and she makes herself -only herself, a new portion. For acting like this -you can divorce her.