Custards, creams & meringues
Crème Caramel / Flan
Crème caramel · A classical French egg custard cooked in a bain-marie (water bath), unmolded to reveal a bittersweet caramel sauce pooling at the base. The custard must be silken, trembling, and entirely free of grain, bubbles, or cracks. It is defined not by its garnish but by its precise technique and water-bath discipline — a ratio of eggs to milk that determines set and texture, and a caramel poured into the mold before baking rather than served alongside.
The formula
500 g whole milk : 130–135 g egg (≈ 2 whole eggs + 2 yolks) : 50 g sugar; separate caramel 100 g sugar
Weight-based for precision. 500 ml whole milk ≈ 515 g. 2 whole eggs + 2 yolks ≈ 130–135 g depending on egg size. This ~3.5–4:1 milk-to-egg ratio by weight gives a custard that trembles at the center when done. For a richer, more set result, reduce milk to 400 g (≈ 3:1). Do not exceed 150 g egg per 500 g milk or the custard will be rubbery.
Identity
- Water-bath cooked at 150–160 °C (300–325 °F) oven, never touching direct heat
- Caramel (100 g sugar, dry or wet method) poured into mold bottom before custard is added
- Egg-to-milk ratio by weight, not volume — eggs are the sole setting agent
- Custard trembles at center when mold is gently shaken; overbaked custard cracks
Ingredients
| Base | Whole milk | Whole milk, not skim. Fat content affects richness and mouthfeel; 3.5% is standard. Do not substitute all cream or the custard will crack. |
| Binder | Whole eggs + egg yolks | 2 whole eggs + 2 yolks = 130–135 g. Yolks provide richness, color, and a softer set; whites alone produce a tough, rubbery texture. This combination is non-negotiable. |
| Liquid | Granulated sugar (custard) | 50 g sugar dissolved into the egg-milk mixture. Sweetens without destabilizing the protein network. Do not exceed 15% of total mixture weight. |
| Flavor | Vanilla bean or vanilla extract | One vanilla bean, split and scraped, infused in warm milk. Or 1 tsp pure extract added off-heat. Vanilla is the defining aromatic. |
| Seasoning | Fine sea salt | A pinch (1–2 g) sharpens all flavors and reduces perceived sweetness. Essential in fine-dining versions. |
| Flavor | Caramel (sugar, for mold coating) | 100 g granulated sugar, dry or wet caramelized to deep amber (170–175 °C). Poured immediately into 6 ramekins and distributed before it hardens. |
Method
- 1Make dry caramel: in a clean, dry heavy saucepan, heat 100 g sugar over medium heat without stirring until it melts, turns amber, and reaches 170–175 °C. Alternatively, use the wet method with a tablespoon of water to prevent crystallization.Caramel at this temperature has the correct bittersweet balance. Below 160 °C it is too pale and sweet; above 180 °C it turns bitter and may burn in the oven.
- 2Immediately divide hot caramel among 6 ramekins (50–60 °C). Tilt each ramekin to coat the bottom evenly. Work quickly — caramel sets in 60–90 seconds.Coating the mold bottom with caramel creates the signature sauce layer upon unmolding. Speed prevents uneven coating or solidification in the pot.
- 3Infuse milk: heat 500 g whole milk with split vanilla bean (and scrapings) to just below boiling (85–90 °C). Remove from heat, cover, and steep 15 minutes. Strain and cool to 50–60 °C.Scalding (near-boiling) denatures milk proteins slightly, improving texture and flavor integration. Steeping extracts vanilla without bitterness.
- 4Prepare egg base: whisk 2 whole eggs, 2 yolks, and 50 g sugar (plus pinch salt) until just combined — do not whip air into it. Pour warm milk (50–60 °C) into the egg mixture in a thin stream, whisking constantly.Tempering prevents egg proteins from coagulating prematurely, which would create grainy curds. A thin stream and constant agitation distribute heat evenly. Whipping air creates bubbles and fragile foam.
- 5Strain the mixture through a fine-mesh sieve lined with cheesecloth or a single layer of paper towel into a pitcher. Skim any remaining foam.Sieveing removes chalazae, fragmentary egg strands, and air bubbles that would cause pinholes or an uneven surface in the finished custard.
- 6Divide custard between the caramel-coated ramekins (each ~115 g). Place ramekins in a deep baking pan. Pour boiling water into the outer pan until it reaches two-thirds up the sides of the ramekins. Bake at 150–160 °C (325 °F) for 35–45 minutes.Bain-marie insulates the custards from direct heat, distributing it evenly and preventing sudden temperature spikes that cause cracking. Two-thirds submersion provides gentle, uniform heat transfer. Check doneness at 35 minutes.
- 7Custard is done when the edges are fully set and the center 2–3 cm trembles like soft jelly when the ramekin is gently shaken. Remove from water bath. Cool to room temperature, then refrigerate uncovered for minimum 4 hours (overnight preferred). To unmold: run a thin knife around the edge, place a plate inverted over the ramekin, and flip decisively in one smooth motion.Residual carry-over cooking continues after removal; removing when the center still trembles prevents overcooking. Refrigeration firms the custard for clean unmolding. Flipping in one motion prevents the caramel from pooling unevenly.
Techniques that matter
Bain-marie / Water bath
The defining technique. Steam surrounding the ramekins provides gentle, even heat (max ~100 °C at surface) that cooks egg proteins slowly and uniformly. Without it, direct oven heat causes the edges to overcook while the center remains raw.
Tempering
Gradually raising the egg mixture's temperature by adding hot liquid in a thin stream prevents the eggs from seizing into curds. Rapid heating (e.g., adding boiling milk all at once) causes instant protein coagulation and a grainy, scrambled texture.
Caramelization (dry or wet)
Sugar caramelizes above 160 °C through pyrolysis, producing hundreds of flavor compounds absent in plain sugar. The caramel coating, poured into the mold before baking, liquefies again during cooking and resolidifies into a pourable sauce upon unmolding.
Doneness testing by jiggle
Egg protein coagulation is irreversible and continues off heat. A properly set custard has a trembling center — firm edges, soft core. Waiting for full visual firmness in the oven guarantees overcooking.
Variations & derivatives
Flan de huevoSpain, Portugal
Egg-forward, using 6–8 whole eggs per 500 ml milk, less sugar (40 g), no caramel topping. Produces a firmer, denser custard closer to a baked custard than a tremulous flan.
Flan mexicano / Mexican FlanMexico, Central America
Uses condensed milk (400 ml) and evaporated milk (400 ml) replacing whole milk, plus 4 eggs and rum or vanilla. The dairy concentration produces an ultra-silken, hypersmooth texture. Caramel is always poured into the mold bottom.
Flan PâtissierFrance
A thick pastry-cream variant (crème pâtissière base, richer eggs) baked in a large mold and served sliced. Popular in Paris pastry shops. The custard is set enough to cut cleanly.
Crème caramel au caféFrance
Espresso or strongly brewed coffee substituted for 50–100 g of the milk. The bitterness of coffee caramel cuts the sweetness of the caramel sauce for a sophisticated result.
Crème caramel au chocolatFrance
50–80 g dark chocolate (70%) melted into the warm milk. The custard becomes a deep brown and the chocolate-caramel pairing is classical.
Used in these dishes
Substitutions
- Whole milk → Part-skim milk — Reduces richness and body; custard sets faster and may taste watery. Skim milk produces a loose, unacceptable result.changes result
- Whole eggs + yolks → All whole eggs (4 eggs) — Custard becomes firmer and paler, with less silky mouthfeel. Acceptable but inferior to the yolk-inclusive formula — yolks are the source of lecithin and emulsifiers that create the characteristic smoothness.
- Granulated sugar → Caster or superfine sugar — Dissolves faster but the difference is immaterial in the custard phase. Do not use brown sugar, which introduces molasses flavor and excess moisture.
- Heavy cream → Heavy cream (replacing up to 30% of milk) — Adds richness and a more decadent mouthfeel. Higher fat raises the coagulation temperature slightly, making the custard more crack-prone. Reduce oven temperature to 140 °C if using cream.
Troubleshooting
Custard cracks on surface or splits when unmolded
Oven temperature too high (>170 °C) or water bath too shallow, causing edges to overcook before center sets. Also caused by jarring the custards during baking or cooling. → Always use a water bath reaching two-thirds up the ramekin sides. Bake no higher than 160 °C. Check at minimum time. If a crack appears mid-bake, reduce temperature by 10–15 °C immediately.
Custard weeps clear liquid on the plate after unmolding
Underbaked: center was still too fluid when removed. Residual liquid did not fully gelatinize and leached out under the weight of the set custard. → Ensure the center 2–3 cm shows a very slight jiggle — not a wobble. The trembling should cease within 1 second of stopping the shake. Increase baking time by 5-minute increments.
Custard is grainy or curdled
Temperature shock from adding overheated milk (>80 °C) to eggs, or from adding milk too quickly without whisking. Egg proteins denature and form curds. → Always temper the eggs: add hot milk in a thin, steady stream while whisking briskly. Milk should be 50–60 °C, not boiling. If curdling has occurred, pass through a fine sieve — it will not rescue the texture but will remove visible curds.
Caramel has crystallized or hardened into a solid mass
Stirring sugar while it melts causes crystallization. Introducing an impurity (a sugar crystal from the spoon, a drop of water) seeds crystallization. → Do not stir at all during caramelization — swirl the pan only. If crystals form, add a tablespoon of water and reheat gently while swirling. Use fresh, clean sugar for each batch.