Some of you may know the “Bain-Marie” baking method already, but for those who don’t, here is a quick run-down.
Preheat your oven to 350 degrees Fahrenheit. (or 175 degrees Celsius)
Place the cake pan covered with aluminum foil, into the larger baking dish with high edges.
Pour room temperature water into the larger baking dish until the cake pan is submerged into water about half way. Refrain from using hot water to save time. Hot water hitting the sides of the cake pan will cause the egg in the custard mixture start to cook too fast causing the loss of creamy texture of the end product.
Put the whole thing into the oven and bake for 1 hour and 15 minutes.
Take the whole thing out of the oven and remove the cake pan from the hot water bath.
Remove, but don’t discard the aluminum foil on top.
Set it aside for at least 2-3 hours, until it slowly and naturally cools down to room temperature.
Once the flan is at the room temperature, cover it with the same aluminum foil tightly and place it in the fridge for at last 4 hours, or preferably overnight.
When you are ready to serve the flan, run a dull but flexible knife around the edge of the cake pan slowly to release the custard from the walls of the cake pan. An icing knife, which is normally used for spreading frosting on cakes, works perfectly for this purpose.
Cover the cake pan with a slightly larger serving plate. In one swift move, flip it upside down and leave on the countertop for a few minutes, so that the gravity can work its magic and the flan pops onto the serving dish on its own, with the rich caramel colored top.
Alternatively, you can make individual flans in small ceramic or porcelain ramekins which are oven safe. If this is what you prefer, you can dispense your caramel in small amounts into each ramekin’s bottom. Let them cool down a bit while you mix your custard ingredients. Then pour custard mix into each ramekin and bake them the same way, covered with aluminum foil, submerged more than halfway in water.