Roll puff-paste which has had six turns to a quarter-inch thickness; cut it into circles with a fluted or plain cutter two and a quarter inches in diameter. It should be icy-cold when cut, for if it sticks on one side it will not rise evenly. From one half the circles cut a hole in the center with a cutter one inch in diameter. Moisten the edges of the whole circles, and place on them the rings. Brush over the top with egg. (This is to glaze them, and the egg must not touch the edges.) Place them on the ice for half an hour, then bake in hot oven for twenty minutes, Bake the small circles cut from the center on a separate tin, as they do not require as much time; when baked pick out from the center any uncooked paste. Use the small pieces for covers after the cases are filled. If preferred, roll the paste one half inch thick, and with the small cutter cut half-way through the paste. When baked lift off the inner circle, and remove the uncooked paste from the interior.