Chocolate raspberry cake with matcha vanilla buttercream

Ingredients

• 1/3 cup brown rice flour
• 2 tbsp almond flour
• 2 tbsp raw cacao powder
• 2 tsp cornstarch or arrowroot powder
• 1/2 tsp baking soda
• a pinch of salt
• 1/4 cup coconut sugar
• 1/4 cup hot water
• 1 large egg
• 4 tsp good quality olive oil
• 2 sticks/230g unsalted butter
• 1 1/2 cup powdered sugar
• 1 tsp matcha powder
• 1 vanilla bean, seeds
• raspberries