Adapted from The Sweet Life in Paris (Broadway) by David Lebovitz
- Cut the prunes into quarters and pour boiling water over them. Cover and let stand until the prunes are soft. Drain.
- Squeeze most of the excess water from prunes and pass through a food mill or food processor.
- Melt the milk chocolate and the Armagnac in a double boiler or microwave, stirring until smooth. Stir into the prune puree. Cool completely to room temperature (it will thicken when cool.)
- Heat the cream in a small saucepan with the corn syrup. When the cream just begins to boil at the edges, remove from heat and add the chopped chocolate. Let sit one minute, then stir until smooth. Stir in the pieces of butter. Let cool completely before using.
- Spread a bit of batter on the inside of the macarons then sandwich them together. (You can pipe the filling it, but I prefer to spread it by hand; it’s more fun, I think.)
- I also tend to overfill them so you may or may not use all the filling.
- Let them stand at least one day before serving, to meld the flavors.
- Store in an airtight container for up to 5 days, or freeze. If you freeze them, defrost them in the unopened container, to avoid condensation which will make the macarons soggy.