I'm not sure, is there not one standard, most accepted recipe and then N variations? Also, I would not except edits to be on ingredients, but mostly on the method. If a user would want to modify ingredients, he could create a his "regional" variation.

But I see the wiki more as a reference book on recipes and their well known variations (which is mostly what I'm looking for when searching for a recipe) than a sharing platform/pseudo social network.