I am often tempted to buy a whole Octopus when I see them on my fish merchant's slab, but the 3 hour cooking time is slightly off-putting.
The easiest way for me to obtain my occasional 8-legged (armed?) treat is to buy them canned. There are plenty of different makes available, and, up until now, they have all been very good.
My preference is to eat the pieces with a small salad, and buttered wholemeal bread, as a lunchtime titbit.
And being reasonably weight conscious, the garlic flavoured oil in which they're packed is (reluctantly) given to the dogs. Woe is me!