Yet another strange poem...

In The Joy of Cooking, Elaine Magarrell talks about chopping up her siblings and eating them.  OR DOES SHE???  At first I was a bit puzzled by the cooking imagery used in the context of the body pars of the narrator's siblings. However, after re-reading the poem, I have a theory as to the method behind Magarrell's madness.  "I have prepared my sister's tongue, scrubbed and skinned...(lines 1 & 2)"  Did the author actually scrub her sister's tongue in preparation to cook it?  Of course not.  I think that the tongue of her sister and heart of her brother symbolize faults in their personalities.  The tongue could symbolize a dirty or cruel mouth, and the heart could represent his unkindness.  Their preparation for cooking represents how the writer wants to fix these faults.  "It resembles muscle more than organ meat and needs an apple-onion stuffing to make it interesting at (lines 12-14)."  Cooking is simply taking different ingredients and making something better.  This is what the narrator wants to do with her siblings.  She wants to make them better people