Soft pavlova roll with liqueur mascarpone and berry compote

Name: Soft pavlova roll with liqueur mascarpone and berry compote
Prep time: 6 h 30 min
Cook time: 25 min
Total time: 6 h 55 min
Cuisine: Australian
Ingredients: 1 x 250g ctn mascarpone; 1/2 cup (125ml) double cream; 1 1/2 tbsp icing sugar mixture; 1 tbsp Grand Marnier liqueur; 7 eggwhites; 1 3/4 cups (375g) caster sugar; 2 tsp cornflour; 2 tsp white vinegar; Icing sugar mixture, extra, to dust; 1/3 cup (75g) caster sugar; 1/3 cup (80ml) water; 1 x 500g packet frozen raspberries, thawed; 2 x 250g punnets strawberries, hulled, thinly sliced; 1 x 150g punnet blueberries; 1 x 150g punnet raspberries