This cheesy rice cracker appetizer is a gluten-free friendly hors d'oeuvre for your guests.
Stir together goat cheese, ricotta, lemon zest, cream, and salt in a medium bowl. Shape into a log that is 2 inches in diameter; wrap in parchment. Chill in freezer until very firm, about 20 minutes.
Unwrap log. Roll in poppy seeds to coat. Wrap in parchment; chill in freezer until very firm, about 20 minutes.
Using unwaxed dental floss, cut log into 1/4-inch-thick rounds. If log begins to soften, return to freezer until firm, then continue slicing. Place each round on a cracker, and top with an olive half. Serve slightly chilled.