Thread:Project:Support desk/hide template in category list/reply

Look at the extension template on this wiki. It is used to classify different templates and even has the Category:Extensions with no license specified category label in it, yet does not show up on that category page. This should give you an idea of how to accomplish what you want.

Other observations -- feel free to ignore these: Why not have the "All recipes" category use sub categories? That way you could use your template to categorize a recipes and they would still be accessible from the "All recipes" category.

What happens when a recipe has been on your wiki a while and is no longer a "new" recipe? It seems like you need to rename your template.