We served this cool, refreshing soup in demitasse cups and filled the saucers with ice to keep it chilled.
Place honeydew in a food processor; puree until smooth. Line a bowl with a double thickness of cheesecloth; transfer puree to bowl. Gather cheesecloth; tie into a bundle. Suspend bundle from a spoon; hang over a bowl, collecting juices in bowl, for 1 hour to yield 4 cups liquid.
Place cucumbers in a food processor; puree until smooth. Add 1/4 cup creme fraiche, jalapeno, cilantro, lime juice, and salt; puree until smooth. Add honeydew liquid; puree until combined. Chill well before serving. Serve with a small dollop of creme fraiche and a cilantro leaf.