Spinach and lemon cake

Name: Spinach and lemon cake
Prep time: 20 min
Cook time: 3 h 45 min
Total time: 3 h 45 min
Yield: 12 slices
Ingredients: 500 g frozen chopped spinach; butter; 200 g grapeseed oil; 4 eggs; 180 g caster sugar; ½ tsp natural vanilla extract; 240 g plain flour; 50 g arrowroot flour; 2 ½ tsp baking powder; 1 tbsp gelatine powder; 3 tbsp lemon juice; 5 pieces lemon zest; 400 g pouring (whipping) cream; 80 g icing sugar; 1 pomegranate