Steps
- Preheat the oven to 375°F / 190°C, with a rack in the middle. Set out a 6-cup flan mold.
- Heat 1½ cups of sugar in a heavy saucepan over medium-low heat, stirring until melted and deep amber. Carefully pour into the mold and tilt to coat the sides. Cool for 10 minutes, until hard.
- Blend 6 large eggs, 397g of sweetened condensed milk, 1¾ cups of whole milk, and 1 teaspoon of vanilla extract for 2-3 minutes, until smooth.
- Pour into the mold and cover tightly with its lid or foil. Place in a roasting pan with 1in / 2.5cm of hot, nonboiling water.
- Bake for 1 hour, until just set with a slight jiggle in the center. Cool to room temperature, then refrigerate for at least 4 hours. Run a knife around the edge and invert onto a rimmed platter.