In a small saucepan, soak the apricots in the Cognac for 10 minutes. Bring to a boil, then carefully ignite with a long match. When the flames subside, add the brown sugar and cook over moderate heat until the sugar is dissolved. Transfer to a food processor and let cool. Add the butter and process until fairly smooth. Season the butter with salt. Scrape the apricot butter into a large ramekin and serve with crusty bread
The apricot butter can be frozen for up to 2 weeks.