I have a bunch of watermelon left over from Father's Day, and I was wondering if I could grind it up and freeze it for Gage. It is "seedless", but still has the white seeds. Do I have to pick out all of those seeds? I do have the Super Baby Food book, but it is kind of unclear (at least to me) as to if it will be okay ground up for cubes. I do have some pineapple juice I plan to add to the mix.