Fairly early in the movie, at the party, Kathleen Kelley (Meg Ryan) finds out that the "Joe" she met earlier is really Joe Fox of the Fox bookstore chain. They get to arguing while they're going around the buffet table at this party.
Joe takes a big scoop of caviar while they're going at it, and Kathleen corrects him, "What are you doing? That caviar is a garnish!" He gives her a defiant look and takes another heaping spoonful of the caviar...which is now completely whole and restored. There is no sign of where he took his last serving from. (There is a close up of the caviar plate both times.)