How do broccoli crowns differ from whole broccoli heads?

The thick lower stalk is cut away, leaving just the florets and short stems. You get less waste and less trimming, but you pay more per pound than for a whole head.

How should I store them?

Keep them unwashed in a loosely open bag in the coldest part of the fridge. They hold for about a week; yellowing florets or an off smell mean they are past their best.

What is the best way to cook them?

Roast at high heat with oil and salt, or steam briefly until just tender. Short cooking keeps the bite and limits the sulfur smell that comes from overcooking.

Yes. Raw florets are firm and mildly bitter, and work chopped into salads or slaws. They are easier to digest when cut small or briefly blanched.

How much should I buy for a meal?

Plan on roughly a quarter to a half pound per person as a side dish. Florets shrink a little when roasted, so lean toward the larger amount for bigger appetites.