@msolga,
It's not the beets that l'k was slow-boiling, it was the gnocchi.
If the gnocchi is very fresh it needs to be handled quite gently, a soft simmer is about all it can handle. As I recall, pasta that uses beet juice in place of other liquid is also quite soft, so it needs even more care. Been a while since I made anything like beet gnocchi.