Pour the full-fat milk into a saucepan and heat over low-medium heat until steam appears and it's hot but not boiling. Do not let it boil vigorously.
Pour the heated milk into two serving bowls. Allow them to cool down and form a "skin" on top. This takes about 10-15 minutes.
Gently beat the egg whites with caster sugar until the sugar dissolves. Do not overbeat until foamy.
Using a sharp knife, carefully make a small cut on the edge of the milk skin in one of the bowls. Gently peel the entire skin off and set it aside. Repeat for the second bowl.
Pour the milk from both bowls (after removing the skin) into the egg white and sugar mixture. Stir well until combined, then strain the mixture through a fine-mesh sieve to remove any lumps or air bubbles.
Place the milk skins back onto the surface of the strained milk mixture in each bowl.
Place the bowls into a steamer over high heat. Steam for about 10-15 minutes, or until the pudding is set but still wobbly in the center. Avoid over-steaming, which can create a tough texture.
Carefully remove the bowls from the steamer. Serve warm or chill in the refrigerator for at least 2 hours before serving.
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