In a medium bowl, place the egg whites with the brown sugar, and stir well.
After continuous stirring using the hand mixer, the sugar dissolves completely with the eggs.
Then, add the flour with 4 tablespoons of milk, then liquid butter, vanilla, and a pinch of salt.
Work on mixing all the ingredients by hand until you get a homogeneous and soft consistency.
In a frying pan over low heat, put half a cup of the mixture, then spread it on the surface until the fish is thin.
After the underside is cooked, turn the biscuits over to the other side.
Hold the biscuit while it is hot, roll it into a cone and secure it.
Repeat the same steps until the quantity runs out, and you get delicious ice cream cookies.