It's filled with sea salt, which you dig out with a small wooden trowel.

It was made of stone and Young had no tools but a hatchet and a wooden trowel.

The dough must be thoroughly worked by hand and let rest overnight; it is then shaped into a circle with a strong rim and a thin center, placed with a wooden trowel directly on the hot floor of a wood-burning tile furnace, baked at 800 to 900 degrees for two to three minutes, and served piping hot.

From the ceiling's last short crossboard hung a large leviathan lamp, while beneath the as yet unroofed yard of tunnel, Cif knelt away from them and worked at the naked face with wooden trowel and gloved left hand, scraping and brushing away the stuff that was of a consistency between flaky sandstone and packed sand.