Place caster sugar and water in a small saucepan with tea bags and bring to boil over a moderate heat. Remove from heat and allow to cool.
Place syrup in a medium saucepan with ginger and cook over a moderate heat until a light caramel. This could take about 5 minutes, but monitor and stir occasionally. 2. Deglaze pan with sparkling wine and add grapes. Remove pan from heat, put a lid on top and set aside to cool slightly.
Soak gelatine leaves in ice cold water and allow to bloom for approximately 15 minutes. 2. Combine spiced syrup, honey, vanilla and wine in a bowl and place in the freezer to chill thoroughly. 3. Remove gelatine leaves from the water, squeezing out excess water, and place in a small saucepan and combine with approximately 50 ml of wine mixture. Gently heat until all the gelatine is molten. 4. Place mixture in an electric mixer with a whisk attachment and add half of the remaining chilled wine mixture. On medium speed, whip mousse for about 5 minutes. Add remaining chilled wine mixture and turn up speed, whip for a further 5 to 10 minutes or until mixture is light and fluffy. 5. Gently fold in finely chopped chocolate.
Place macerated grapes and a little of the juice in the bottom of a serving glass and top with sparkling wine mousse. 2. Garnish dessert with a Lindor Ball of your choice, as well as some chocolate squiggles. 3. Serve at room temperature with a glass of sparkling wine or a chilled Moscato.