Roast 1 tbsp. grated coconut in a pan without fat and remove. Peel and chop the bananas. With coconut milk, 1 tbsp. unroasted grated coconut and sugar, puree finely in a mixer.
Season to taste with cardamom. Pour the shake into four glasses and fill each with 25 ml espresso. Sprinkle with roasted coconut flakes and serve immediately.