The main deal:
4 oz. semisweet chocolate
1 can sweetened condensed milk
1/3 cup dark rum
200 g chocolate cookie crumbs
1 1/4 cups finely chopped walnuts
1 tsp. vanilla
1 more cup of finely chopped walnuts
Melt chocolate in a saucepan over very low heat with the sweetened condensed milk. Remove from heat and stir in other ingredients. Chill in fridge for at least an hour. If leaving overnight, cover tightly to prevent the top from drying out.
Shape mixture with hands into teaspoon-sized balls. Toss in remaining finely chopped nuts. Allow to sit out for a few hours to dry out slightly on the outside. Store cool and dry for a couple of weeks. May be frozen for longer, but thaw without opening to prevent condensation from making them soft and sticky.
Follow the same procedure as for Rum Balls, but substitute hazelnut liqueur for rum, and hazelnuts for walnuts.