In a small pot, combine sugar with ¾ cup water; bring to a boil and cook until sugar is dissolved, stirring occasionally. Cool slightly.
Put all ingredients except for chocolate shavings in a blender and purée until completely smooth, stopping machine to scrape down its sides if necessary. Divide among 4 to 6 ramekins and chill for at least 30 minutes. If you like, garnish with chocolate shavings before serving.
