Pre-prepared beetroot is crap and over priced! this is such a simple vegetable to cook it just takes a bit longer. this is how we do it.

Boiling salted water
Beetroot (unpeeled)

Add the beetroot to the seasoned water then cook until soft (do not peel the beetroot). If you have a lid it will dramatically improve your cooking time. after an hour or so (depending on the size of your beets) they should have softened. cool them down in the cooking liquid then run them under cold water. they should peel very easily now with a small knife. We would then dress them in oil, vinegar and salt or toss them in hot butter and salt