Caramel pudding

Ingredients:

• 3/4 cup sugar
• 12 large egg yolks, room temperature
• 340 gr. sweetened condensed milk
• 340 g of condensed milk with sugar
• 1 tsp vanilla extract
• 1 tsp. grated lemon zest

Preparation:

1. Place about 2 tablespoons of sugar in a small saucepan. Let the sugar melt over low heat for about 15 minutes. Gradually add 1 tablespoon of sugar at a time, stirring slowly and allowing it to melt before adding the next tablespoon. This is a long process that requires constant attention to prevent the sugar from burning. When all the sugar has melted completely, it will have turned a rich, dark caramel color, about 40–45 minutes.
2. Carefully pour the caramel into a 22cm (9.5in) cake pan, covering the bottom completely. Let cool completely, about 20 minutes.
3. Meanwhile, preheat oven to 175°C.
4. Prepare a water bath:
   
   Place a large baking dish on the middle rack of the oven. Bring about 2 liters of water to a boil, then carefully pour the boiling water into the dish in the oven.
5. Gradually whisk the egg yolks in a medium bowl, then add the condensed and evaporated milk, vanilla extract, and lemon zest (if using). Stir gently, but do not over-beat to avoid introducing air, which will result in a thick, smooth texture.
6. Once the caramel has cooled, pour the cream through a fine-mesh sieve into the cake pan. Tap the pan lightly on the countertop to release any air bubbles.
7. Once the oven is hot enough, carefully place the pan in a water bath.
8. Bake until the center of the custard is set and a toothpick inserted into the center comes out clean, about 1 hour. Remove the pan from the water and let the custard cool to room temperature. Cover and refrigerate for at least 5 hours.
9. Let it come to room temperature. Take a sharp knife and run it between the edge of the flan and the side of the pan. Press a large plate firmly against the pan and, in one smooth motion, invert the plate and pan. Carefully remove the pan. Slice and serve the dessert at room temperature; it will acquire a pleasant milky flavor.