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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
There should really be some mention of this in the description.
Hint: It doesn't work if your solution modifies the recipe. The random test cases all use the same recipe object to compute expected outcomes, AFTER it is passed to the solution function.
Try it again. Comment above yours seems to be experiencing same issue and it did not persist. Worth looking at what causes this.
Keep in mind that 166 others have already completed this kata.