Mechový dort (Czech Spinach Cake with Mascarpone)

Name: Mechový dort (Czech Spinach Cake with Mascarpone)
Total time: 1 h
Ingredients: 400 g baby spinach; 3 eggs; 1 cup icing sugar; 0.75 cup rapeseed oil; 2 cups plain flour; 2.5 tsp baking powder; 2 tbsp lemon juice; lemon zest; 250 ml whipping cream; 125 g mascarpone; 1.5 tbsp icing sugar; 1 tsp vanilla extract; pomegranate as needed; blueberries as needed