Preheat oven to 350 degrees
Whisk together sugar, egg yolks, eggs, liqueur and grated lemon rind;
whisk in milk and cream. Strain into pitcher.
Pour into six 1-cup ramekins or custard cups. Sprinkle with blueberries.
Place in large shallow roasting pan; pour in enough hot water to come halfway up sides of ramekins.
Bake in centre of oven for about 35 minutes or until edges are set but centres still slightly jiggly. Let cool.
(Make ahead: Cover and refrigerate for up to 1 day).
Topping: Just before serving, sprinkle sifted brown sugar over crèmes.
Place on baking sheets; broil just until sugar melts and turns caramel color.
(Or caramelize sugar with blowtorch).