Keeping Apple Wedges From Turning Brown

My kids, especially the little ones, like their apples in wedges and they can’t eat a whole one anyway, but it gets brown by the time they can eat lunch in school (very unappetizing). I have tried the lemon juice thing to keep them from getting brown, but then the kids don’t like the taste. Does anyone know how to keep the cut surfaces from turning brown? Thanks so much. I don’t want to buy those expensive packages of apple wedges in the store!