It may cost more but do try to find a good quality liqueur as opposed to something like Hiram Walker which tastes like sugar. I like Mathilde Black Currant Liqueur from France.
Prep Time 15 minutes minutes
Cook Time 30 minutes minutes
Total Time 45 minutes minutes
This can easily be made the day before, just leave out the raspberries, tablespoon of butter and syrup. About an hour before serving, place in the top of a double boiler to heat up and keep warm. Add raspberries, butter and syrup (this should be made just before serving). Even if I double the recipe I still only use 1 package frozen raspberries.