cook a cooked rom?

[sevenspeed]

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Is it possible to take a cooked rom or roms and modify them in the kitchen? I tried several roms for my touch pro and they were all very good and I do appreciate the chefs but each had something one of the others were missing for my personal taste. Also, most had programs I dont't use and I'd like to declutter.
If not I'll have to read up on how to make one from scratch, I'm downloading the kitchen right now but am good at computers and learning even though no experience with this.