Peter, we're aware of the 'kale [collard greens]' ingredient-variation mismatch, and it's definitely on our list of ingredient fixes to make when our tech staff can split them apart without negatively affecting all the recipes that have been indexed with one or the other of those ingredients. Note, though, that we do have an ingredient 'tough greens, e.g. kale, collards, mustard or turnip' that legitimately associates kale and collards, and many recipe titles do contain the words 'kale' and 'collard(s)' together and will be retrieved in a search for either one of these greens. Even after we split up our 'kale' and 'collard greens' ingredients, if you try to eliminate either "kale" or "collard(s)" from your search, you'd be excluding those recipes that reference both of them.