Heat the brown sugar and milk in a saucepan over medium heat until the sugar is dissolved.

In a bowl, combine the corn flour, cornstarch, and baking powder. Stir to mix.

Add the milk and sugar mixture, eggs, and butter to the dry ingredients.

Knead the dough, then shape into 30-gram balls. Roll each ball into a strip and join the ends to form a ring.

Place the rings on a baking sheet and bake for 20 minutes at 480°F (250°C).