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).
1 Cook the green beans in a pot with salted water until JUST tender (about 5 minutes, you can steam the also) drain and transfer to a large bowl of ice water to cool; drain and pat dry with a paper towel (this can be done a day ahead). 2  Melt butter in a skillet over medium heat.