There's another way to cook them makes them into a kind of crispy not-quite-like-a-doughnut thing.
Cut the stems as long as possible so to get the best of the base of the stem, cut those into 2" lengths and peel them like you would rhubarb. Boil for 7 or 8 minutes...just until you can slide a knife easily into them.
Drain and let cool. Dip into a batter made from either gluten free flour and some fine cornmeal or an ordinary white flour batter that you'd use for fish. If you want to use a beer batter that's fine and will work.
Deep fat fry the little battered pieces until golden brown. Lift out and drain, and shake with castor sugar while still warm.
Much the nicest way I know of eating Alexanders
Otherwise I just cook them as above and then put them in a dish with butter and loads of ground black pepper, and sea salt flakes.
Haven't tried them with hollandaise sauce, Broch. It sounds good, bit like baked leeks ?
M