Vegan carrot cake with orange frosting

Name: Vegan carrot cake with orange frosting
Prep time: 15 min
Cook time: 2 h 5 min
Total time: 2 h 5 min
Yield: 12 portions
Ingredients: 60 g extra virgin olive oil; 110 g boiling water; 15 g flaxmeal; 150 g walnuts; 280 g carrots; 60 g sultanas; 160 g Rapadura sugar; 1 banana; 250 g wholemeal self-raising flour; 1 tsp ground cinnamon; 1 tsp vanilla bean paste; 30 g plant-based milk; 100 g raw cacao butter; 1 tbsp arrowroot flour; 40 g pure maple syrup; 80 g plant-based milk; 3 tsp vanilla bean paste; 1 - 2 pinches salt; 40 g vegan butter; 1 orange