The "How to..." tag isn't infallible for a couple of reasons:
1. You can still get recipes with the How to... tag that contain clotted cream as an ingredient. But the recipes at the top will be the most relevant as "clotted cream" is in the recipe title.
2. The "How to..." tag was created some time into EYB's operation so there will be a lot of recipes that should have the tag but haven't yet. If any member feels the tag should be added to a recipe then email us and we will add it.