Place the egg yolks, ginger, brandy, apple juice, brown sugar, sugar and vanilla in a metal mixing bowl and whisk until smooth. Place over simmering water in a saucepan. Do not allow the water to touch the bottom of the bowl. Whisk the sabayon while cooking for approximately 5 minutes or until thick. The sabayon should look like very soft whipped cream and should coat the back of a spoon. Fold in, or top with your favorite berries.