A plate of Watercress sandwiches.
A watercress sandwiches is a type of Earth food made with bread and watercress.
When Admiral Alynna Nechayev beamed aboard the USS Enterprise-D in late 2371, Captain Jean Luc Picard prepared a plate of Bularian canapés, watercress sandwiches and a pot of Earl Grey tea to make the Admiral feel welcome aboard the Enterprise. (TNG: "Journey's End")