Prepare the bread: Use dehydrated or lightly toasted bread (not soft). Break 400 g of bread into pieces with some lumps remaining. This dehydration adds a unique aroma.
Soak the bread: Soak the broken bread pieces in 400 cc of milk mixed with 1 tablespoon of vanilla essence. Let it rest until the bread is fully hydrated and forms a dough-like consistency.
Prepare egg and sugar mixture: Beat 3 whole eggs with 125 g of sugar until well combined and smooth.
Combine ingredients: Add the egg and sugar mixture to the hydrated bread. Mix well. Then add 100 g of grated salted hard cheese and 40 g of softened or melted butter. Stir to combine.
Add raisins: Add 30 g of raisins soaked in rum to the mixture and fold them in.
Prepare baking container: Line a baking container with waxed paper and brush the bottom with papelón syrup or a brown sugar syrup substitute.
Bake the bread cake: Pour the mixture into the prepared container. Bake in a preheated oven at 170ºC (350ºF) for about 30 minutes or until a skewer inserted comes out clean.
Serve: Let the bread cake cool for easier handling. Serve warm or cold, optionally drizzled with additional papelón syrup for extra sweetness and flavor.