PREHEAT oven to 325º F. Grease 8-inch-square baking pan.
HEAT chocolate, sugar, butter and water in small saucepan over low heat, stirring constantly, until chocolate and butter are just melted. Remove from heat. Stir in eggs, one at a time, until mixed in. Stir in liqueur. Add flour and salt; stir well. Stir in cheese and orange zest. Pour into prepared baking pan.
BAKE for 35 to 40 minutes until wooden pick inserted in center comes out still slightly sticky. Cool in pan on wire rack. Cut into bars.