Gluten free Classic Polish "tort"

Name: Gluten free Classic Polish "tort"
Prep time: 30 min
Cook time: 2 h 25 min
Total time: 2 h 25 min
Yield: 20 portions
Ingredients: butter; gluten free flour; 90 g white rice flour; 80 g potato starch; 1 tsp gluten free baking powder; 60 g flaked almonds; 8 eggs; 200 g white sugar; 2 tsp natural vanilla extract; 250 g fresh blueberries; 100 g jam sugar; 50 g water; 1 ½ tsp freshly squeezed lemon juice; 1 tsp vegetable oil; 150 g water; 50 g freshly squeezed lemon juice; 500 g fresh mixed berries; 500 g mascarpone cheese; 600 g pouring (whipping) cream; 80 g icing sugar; 2 tsp natural vanilla extract; fresh mixed berries; fresh mint