Add the optional brandy and cook 1 minute. Transfer the contents of the skillet to an electric food processor and process, adding the remaining butter a little at a time and scraping down the sides of the processor once or twice, until smooth.
2 tbsp brandy, 6 tbsp cold butter
Press through a fine sieve and pack into a 2-cup (500 ml) loaf pan that has been lined with plastic wrap.
Chill for at least 3 hours to overnight.
To serve, dip the pan in warm water and invert onto a cutting board.
Remove the plastic wrap and smooth with a knife.
Serve with toast points, crackers, or Melba toast.