Grate the peel from the lemon. Heat the cream and dissolve the chocolate in it; add butter and lemon rind. Put the mixture in the fridge for 2 hours. Make small balls with a large teaspoon. Roll the balls through cacao.
Melt 200 gram chocolate with 40 ml cream in the microwave. Chop the walnuts very small. Add liqueur and walnuts to the chocolate mixture and put it in the fridge until it is a supple mass. Form small balls with the help of 2 teaspoons. Put these back in the fridge while you melt the rest of the chocolate with 1 tablespoon cream. Roll the balls through the melted chocolate. Put back in the fridge for another hour. Dust with powdered sugar.
You can usea liqueur like Cointreau of Drambuie, or another home made liqueur. A fantastic recipe for orange liqueur can be found here.
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