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).
(The water should not reach the bottom of the steamer.) Place the leaves in the steamer, cover, and steam 3 to 5 minutes, or until completely wilted. 4. If desired, add Â½ teaspoon of salt to each canning jar. Fill each jar loosely with the leaves and pour fresh boiling water over them. Leave 1 inch headspace.