Cazuelas, terra cotta dishes, have been used in Spain for literally thousands of years -- from the humblest home to the grandest manor house. Terra cotta is basic earth, low fired with an interior glaze.
A 4.5-inch diameter dish is a handy size to serve tapas such as olives, almonds, caper berries etc. Put an extra one beside the other dishes for olive pits or stems.
The glaze on the cazuelas is lead-free and the cazuelas are safe for the stovetop or oven. If you want to use them over stovetop burners, be sure they are pre-soaked in water before the first use.