Wood will expand and contract across the grain, and a wide panel made of solid wood could change width by a half of an inch, warping the door frame. By allowing the wood panel to float, it can expand and contract without damaging the door.
Put trimmed and cleaned green beans in the steamer basket, set over the boiling water, cover, and steam until tender to the bite, 3 to 5 minutes (depending, again, on how crisp or tender you like your green beans).
Cauliflower: Cauliflower florets will steam on the stovetop in about six minutes. For microwave steaming, cook cauliflower for three to four minutes. Green Beans: Steam green beans on the stovetop for about five minutes. In the microwave, steam green beans for three to four minutes.