I write cookbooks and have done so for nearly 40 years. (I have had a sad life.) Copyright of any published recipe may belong to the author as in the case of celebrities, such as Jamie Oliver and Nigella Lawson, or it may belong to the publisher, as in the case of nonentities such as me. In either case, simply copying the recipe and republishing it breaches the copyright.
• You cannot copyright the title of any recipe.
• The way the recipe is written is what gives it the copyright. So while no one can copyright a recipe for, say, Coq au Vin, the way the method describes how it is prepared is copyright. So if the method is full of a glug of olive oil, several glugs of red wine and cooking until it's pukka, the chances are it has been lifted from Jamie Oliver. If it's basically the same recipe, which of course it will be as this is a classic recipe, expressed in terms of 2 tablespoons olive oil, 500 ml red wine and cooked until tender and the juices run clear when the thickest part of the chicken is pierced with the point of a sharp knife, it's not Jamie Oliver but absentgrana. However, simply changing parsley to mixed herbs and onions to shallots but keeping the style of the method does not make the recipe non copyright.
• Any introductions, cook's tips, variations, freezing instructions etc. are also copyright.
• Generally speaking, neither individuals nor publishers are very willing to release copyright even for charity.
Your friend will need to obtain a signed declaration that the recipe is not copied from a published source.
It can be done. I contributed to a cookbook of recipes provided by local people, most of them amateurs, to raise money for our hospice. It has been very successful.