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Mix all the ingredients using a wooden spoon in a large bowl, working them well and gradually adding the flour.

It will require all of the flour of the recipe, you are aiming for a mixture that is a bit firmer than a cake batter.

Brush a baking pan with oil and dust with flour, then pour the mixture in it, spreading it evenly with the back of a spoon.

Bake in an oven using the fan at 180°C for 35-40 minutes. 

Check if it is done using a wooden skewer.

When it cools, dust with sugar.