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In a large bowl, mix grated tapioca, sugar, and coconut milk. Add 80 ml water and mix thoroughly. Divide the mixture into two equal portions.
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Set aside one portion as the plain (uncoloured) mixture.
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Rinse the blue pea flowers, then boil until the water turns a deep blue. Strain and squeeze out all the liquid. Measure 80 ml of the blue pea flower water and gradually mix it into the second portion to form the blue tapioca mixture.
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Add another 80 ml of water to the plain mixture so both mixtures have equal liquid content.
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Line a 22 cm pan with baking paper and lightly grease the sides. Pour in half of the plain mixture and spread evenly.
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Arrange a layer of sliced bananas over the plain layer, keeping them about 1.5 cm away from the edges.
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Spread half of the blue mixture over the bananas.
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Add the remaining plain mixture, followed by another layer of bananas, then finish with the remaining blue mixture.
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Cover the surface with pandan or banana leaves. Steam over high heat for about 1 hour.
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Remove the leaves, pour off any excess water on the surface, and allow the kueh to cool for about 1 hour.
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Mix grated coconut with salt and pandan leaves, then steam for 10 minutes. Set aside to cool.
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Carefully unmould the kueh. Top generously with the steamed coconut and serve warm.