1. Place the butter or margarine, castor sugar, treacle and lemon juice in a saucepan and simmer over moderate heat until the butter has melted, stirring occasionally. Remove from the stove. Add the flour, salt and ginger and mix well.
  2. Drop 2 - 3 teaspoonfuls of the batter, 12 cm apart, on well-greased baking sheets and bake at 190 °C for about 5 minutes, or until rich brown and well spread out. Remove the baking sheet from the oven and allow the brandy snaps to cool for no more than 1 minute. While still warm, wrap each biscuit around the handle of a wooden spoon to make a roll. Allow them to firm before removing the handle and lifting them onto a wire rack to cool completely.
  3. Repeat with the remaining batter. Store in an airtight container until needed, then serve filled with whipped cream laced with brandy.
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