Put the sago in a bowl and cover with hot water, soak for about 10 minutes. Peel the bananas and cut diagonally into 2 cm thick slices.
Then pour the sago over a sieve and drain completely, put the coconut milk, 400 ml water and the sugar in a saucepan and heat while stirring until the sugar has dissolved. Bring to the boil and add the banana slices. Reduce the heat, add the sago and simmer over a low flame, stirring constantly, until the sago pearls are transparent.
Season the pudding to taste and fill it into portion bowls. Finely chop the peanuts with a knife and sprinkle over the pudding.