if you did want to reuse it you could get a large spinning composter and throw your fruit peels and put whatever additives you wanted into it.. throw in some worms and turn it once a day and eventually all the roots and matter in there would be composted into good soil.. but again this take months and may or may not be worth the hassle..
im no soil grower but i know my grandmother used to do this with her plants and had several large composters and it took a lot of time