In blender or bowl of food processor with knife blade attached, purée cherries 5 to 10 seconds or until cherries are coarsely chopped. Scrape down bowl, and add yogurt, juice, honey, cinnamon and liqueur, if desired. Purée 5 to 10 seconds or jus
Transfer mixture to large pitcher. Cover and chill at least 1 hour before serving.
To serve, pour into glasses or bowls. Garnish each with yogurt and almond slivers, if desired.