In top of double boiler melt chocolate and butter together. In large bowl, with electric mixer, beat eggs and sugar at high speed until lemon colored. Add the chocolate/butter mixture and beat at medium speed until the butter is completely mixed in. Add the brandy & mix throughly. Pour the mixture over the biscuits. Mix well. Line a 23 cm cake pan with plastic wrap. Pour in the mixture and cover with plastic wrap. Freeze until ready to serve.