It's easy. I did transplants with mine when I grew it a couple of seasons ago. I planted 2 to 3 in a cell pack (72 cells per flat), and planted them out when they were about 4 to 6 inches tall. Sowed in April, planted out mid-May, and harvest was in late June. They got to be about 18" to maybe 2 feet tall, IIRC. I just waited until the first flower buds on the stalk were close to popping open, and picked the whole thing off at ground level.

To use it, I cut off the lower tougher part of the stalk, saving the leaves, and threw leaves and the upper portion with the buds into the pot.

Basically, just think of it as kale with the bonus of a small broccoli type floret on top. The floret is quite small, maybe quarter sized.

I think it would be fine as a spring or fall crop.

Laceyvail

In my zone I am growing right now, I started like I do broccoli and then put the transplants in the garden. The first transplants I used it as kailan, harvested the whole plant and stir fry, cutting out the bottom tough part and used a potato peeler for the stalk.
I thought maybe there is another way to eat it, like you I was confused and I tried different way. I harvested just the tops like broccoli flowerets and now I am getting new shoots just like broccoli does but this one are more slender like broccolini stalks.

Here are the ones that I harvested whole

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Here are the others that I cut the tops

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You can see on this one the cut part and 2 more stalks coming up

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Silvia

Thanks to both of you.