Bring 1/2 l milk to the boil in a saucepan. Stir starch and 3-4 tablespoons of water until smooth. Stir the chai powder into the boiling milk with a whisk and continue stirring until the powder has dissolved. Stir in starch, bring to the boil and simmer for about 1 minute.
Let the pudding cool down while stirring occasionally.
Whip the cream until stiff and fold into the chai cream. Pour cream into 4 glasses and chill for about 1 hour.
Heat 1/8 l milk and froth it up vigorously with a whisk or milk frother. Spread milk foam on the glasses. Dust with cocoa and serve immediately. Delicious with fine pastries, e.g.
such as tender biscuits.