For the Caramel:
- 1 cup granulated sugar
- 1/4 cup water
For the Coffee Custard:
- 4 large eggs
- 2 large egg yolks
- 1 can sweetened condensed milk (14 ounces)
- 2 cups whole milk
- 2 tablespoons instant espresso powder
- 1 teaspoon vanilla extract
- 1/4 teaspoon salt
8-inch round flan mold.
Large roasting pan
Fine mesh strainer
Make the caramelYou add the sugar and water to a medium saucepan and heat it over medium heat, watching it turn amber without stirring. Stirring at this stage crystallizes the sugar and turns it into a rock stuck to the bottom of the pot. Coat the moldYou pour the hot caramel into the mold and swirl it around to coat the bottom evenly. The caramel hardens quickly at this stage, which is exactly the intended result. Mix the custardYou whisk the eggs, yolks, condensed milk, whole milk, espresso powder, vanilla, and salt together in a large bowl until smooth, avoiding an overly aggressive whisking motion that traps extra air bubbles. Strain the mixtureYou pour the custard through a fine mesh strainer into another bowl, catching any small cooked egg lumps along the way. Fill the moldYou pour the strained custard directly over the hardened caramel, trusting the process even though pouring liquid over solid candy feels counterintuitive. Prepare the water bathYou place the filled mold into a large roasting pan and carefully pour hot water into the roasting pan until it reaches halfway up the sides of the mold, avoiding splashes into the custard itself. BakeYou bake the flan at 325°F for fifty to fifty-five minutes, checking that the edges look set while the center still wobbles gently like a water balloon when the pan shakes slightly. Chill completelyYou remove the flan from the water bath, let it cool fully on the counter, then refrigerate it for a minimum of four hours. Rushing this step leaves you with coffee soup instead of a firm custard. Flip the flanYou run a thin knife around the edge, place a plate on top, and flip the mold over in one confident motion, lifting the mold away to let the caramel cascade down the sides.
Recipe Notes
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Sugar: I use plain white sugar for the caramel, never brown sugar.
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Milk: I use sweetened condensed milk plus whole milk, never evaporated or skim.
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Coffee: I use instant espresso powder for the strongest flavor.
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Chilling: I refrigerate the flan for the full four hours, ideally overnight.
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Storage: I keep the flan in its caramel sauce in the fridge for up to four days.