Roll puff paste one-quarter inch thick, shape with a patty cutter, first dipped in flour; remove centres from one-half the rounds with smaller cutter. Brush over with cold water the larger pieces near the edge, and fit on rings, pressing lightly. Place in towel between pans of crushed ice, and chill until paste is stiff; if cold weather, chill out of doors. Place on iron or tin sheet covered with brown paper, and bake twenty-five minutes in hot oven. The shells should rise their full height and begin to brown in twelve to fifteen minutes; continue browning, and finish baking in twenty-five minutes. Pieces cut from centre of rings of patties may be baked and used for patty covers, or put together, rolled, and cut for unders. Trimmings from puff paste should be carefully laid on top of each other, patted, and rolled out.