Use of waste food n used compost

hi,
i would like to know if i can gather some old used compost with food waste (no oil) and create a new/usable compost? Will that be organic enuff for plants or will dat just be a waste of time?
Thank you
i would like to know if i can gather some old used compost with food waste (no oil) and create a new/usable compost? Will that be organic enuff for plants or will dat just be a waste of time?
Thank you