Step by step

Add the cooking water of the asparagus tips to the pan and bring to a boil. Once the asparagus are cooked, add the tips and remove from the heat.

Tips
To make your broth even more inviting you could also use the purple asparagus of Albenga, combined with the more common varieties.
Trivia
Carrots may appear to be all the same: in fact, there are a great many varieties, some even of a different colour from the classic orange, such as white or red.