The Science Behind crème caramel or flan (2024)

Mexican flan, a distant cousin of the crème brûlée, is a smooth, decadent custard-based dessert. Next time you do Mexican night at home, this will be the perfect finishing touch to your fiesta — it’s not as tricky to make as you might think. Here’s how it’s done.

The Science Behind crème caramel or flan (1)

The science of perfect flan lies in the fact that, unlike most custard-based dishes, it contains both egg yolks and egg whites. Egg yolks are made up of fat, protein and about 50% water. The fat in the yolk gives desserts like crèmebrûlée, crème caramel andflan their creamy and smooth texture.

However, if we tried to make flan with yolks alone it would not set, because the mixture wouldn’t contain enough protein and water. This is why we need the egg whites. Egg whites are made up of 80% water. They contain no fat (as you may remember from our meringue making adventure) and slightly more protein than egg yolks, giving them wonderful thickening power. Adding egg whites to the flan ensures that it will set beautifully, so we can turn our little custard beauties out of their moulds to serve.

Keeping all of that in mind, let’s start making our flan.

Ingredients:

For the caramel sauce

150g sugar
6 tbsp water

For the custard

4 large eggs
1/2 tsp vanilla extract
30g caster sugar
600ml full cream milk

You will also need:

6 x 200ml pudding moulds
A roasting dish for baking
A stainless steel saucepan for making the caramel

Method:

1. Preheat the oven to 150℃.

TIP: Heat the pudding moulds in the oven while you’re make the caramel. This will make it easier to spread the caramel and also prevent crystallisation.

2. Heat the sugar and water over medium heat, stirring (with a wooden spoon) until all the sugar has dissolved. Boil without stirring until the mixture turns a light copper colour.

TIP: At this point, immediately put the bottom of the pan into a sink full of lukewarm water. This will stop the caramelisation and prevent burning.

3. Quickly pour the caramel into the bottom of the pudding moulds and set aside to cool at room temperature.

The Science Behind crème caramel or flan (2)

4. Once the caramel has hardened, butter the sides of the pudding moulds so the pudding doesn’t stick.
5. Gently warm the milk in a saucepan over the stove. It must be warm, but not boiling or too hot to dip your finger in. (The temperature here is key, so be careful).
6. Whisk the eggs, vanilla and sugar together in a bowl.
7. Once the milk is warm, pour it into the egg mixture and whisk until smooth. Then pour your mixture into the prepared moulds.

The Science Behind crème caramel or flan (3)

8. Place the moulds in a roasting dish and carefully fill the dish halfway with boiling water.
9. Bake the flans for about 20 minutes, or until a knife inserted into the center comes out clean.

TIP: They will still be quite ‘wobbly’, but don’t be tempted to leave them in for too long as this may result in sweet scrambled egg.

The Science Behind crème caramel or flan (4)

10. Cool the flans in the fridge for at least an hour, preferably overnight. This will allow the custard to absorb the caramel flavour, and for the caramel to steal water from the custard and soften.
11. Gently loosen the sides of the custard with a palette knife, and turn upside down onto a dessert plate to serve.

It’s as easy as that — your decadent, creamy treats are ready to be shared and enjoyed.

The Science Behind crème caramel or flan (5)

Flan is a greatchoice for summer days and for when you need to make something ahead.

The Science Behind crème caramel or flan (2024)

FAQs

The Science Behind crème caramel or flan? ›

The science of perfect flan lies in the fact that, unlike most custard-based dishes, it contains both egg yolks and egg whites. Egg yolks are made up of fat, protein and about 50% water. The fat in the yolk gives desserts like crème brûlée, crème caramel and flan their creamy and smooth texture.

What's the difference between flan and crème caramel? ›

That said, creme caramel is often made with a combination of whole egg and egg yolks while flan uses only whole eggs and often doesn't contain sweetened or condensed milk. However, the end results are desserts that are nearly identical in taste and texture and the different names are used interchangeably.

Why is my caramel hard in crème caramel? ›

It's normal. Caramel hardens when you pour it into a ramekin but gradually melts into syrup during cooking.

How do you explain what flan is? ›

Flan is a baked custard dessert with a layer of caramel on top. To make flan, you first caramelize sugar, pour it into a round mold or individual baking cups, and then top it with custard made from eggs, milk or other dairy, sugar and flavorings.

Why does crème caramel have bubbles? ›

Look for golden, about to turn brown and place the saucepan straight into a bowl of cold water to stop the caramel darkening any more. You want to avoid small bubbles forming in the custard, which is usually a sign that the custard has overcooked.

Which came first flan or crème caramel? ›

A dessert similar to 'flan' has been a traditional sweet for centuries in Spain. The French version, called 'Crème Caramel', became popular in the 19th century. Both versions involve a custard base made with eggs and milk and a layer of clear caramel.

Is the caramel in flan supposed to harden? ›

(The caramel will harden against the bottom of the ramekin almost immediately – this is normal, so don't worry about it!)

Why did my flan fall apart? ›

The eggs are what help the custard set, and without them, the flan would fall apart. While it may be a lot of egg yolks, the end result will be completely worth it!

What thickens caramel? ›

For each cup (240 mL) of caramel sauce that you need to thicken, run 1 tbsp (14.7 mL) of cold water into a measuring cup, and slowly stir in 1 tbsp of cornstarch. Pour the cornstarch mixture into your pot caramel sauce, and stir constantly. Keep the sauce on low heat until it begins to thicken.

How does creme caramel stay liquid? ›

Sugar is hydophilic - it absorbs moisture. Some of the moisture in the custard is absorbed by the hard caramel, eventually dissolving it to the point it becomes a liquid. The process takes a while - it doesn't just happen when the flan is being baked - most of it happens during the cooling period, in the refrigerator.

What is a fun fact about flan? ›

The Roman Empire is the true origin of this dessert. The word flan is the French equivalent of the Latin word fladon, which comes from the Old High German word “flado,” meaning “flat cake.” Flan was once a savory dish, usually made from fish or meat. Today, the dessert has evolved into something sweet.

What is flan called in America? ›

Flan may refer to: Crème caramel, a custard dessert with clear caramel sauce, the most common US meaning. Flan (pie), an open sweet or savoury tart, the most common UK meaning.

What is special about flan? ›

The consistency of flan is very smooth and creamy with a sweet, milky flavor. It's also topped with a thin caramel sauce, made by carefully melting granulated sugar until golden brown. Flan is cooked upside down, with the caramel sauce going into the baking dish first, then the custard mixture on top.

How long do you let flan cool before flipping? ›

Cool fully in the refrigerator at least 2 hours, preferably overnight. When ready to serve, run a paring knife or offset spatula along the edge to loosen the flan from the dish and flip over onto a rimmed plate to catch the caramel sauce.

Why is my crème caramel bitter? ›

The caramel shouldn't bee too dark as it will be bitter or to light as it has no flavour.

Is crème brûlée just flan? ›

Crème brûlée is a baked custard made with cream, sugar and egg yolks with a thin layer of sugar on top that is caramelized with a kitchen torch to create a hard caramel crust. Flan is also a custard made with cream, milk, sugar and egg yolks, but it's baked in a caramel-lined ramekin until soft and jiggly.

Is flan the same as caramel custard? ›

Is flan the same as custard? Flan (also known as crème caramel) is a custard of sugar, milk, cream, and egg yolks, baked in a caramel-sauce-lined ramekin until soft and wiggly. All custards are egg based which would make flan a type of custard.

Are crème brûlée and crème caramel the same thing? ›

Two delicious desserts that are beloved! Crème Brûlée and Crème Caramel. Crème Brûlée is made with a milk but mostly cream base and Crème Caramel has a milk base.

Top Articles
Latest Posts
Article information

Author: Msgr. Benton Quitzon

Last Updated:

Views: 5544

Rating: 4.2 / 5 (63 voted)

Reviews: 86% of readers found this page helpful

Author information

Name: Msgr. Benton Quitzon

Birthday: 2001-08-13

Address: 96487 Kris Cliff, Teresiafurt, WI 95201

Phone: +9418513585781

Job: Senior Designer

Hobby: Calligraphy, Rowing, Vacation, Geocaching, Web surfing, Electronics, Electronics

Introduction: My name is Msgr. Benton Quitzon, I am a comfortable, charming, thankful, happy, adventurous, handsome, precious person who loves writing and wants to share my knowledge and understanding with you.