Most write-ups of flan and natillas treat the pairing as a matter of taste: two beloved egg custards that happen to share a dessert list across Spain. That misses the actual reason the two show up together, again and again, on the same laminated Pamplona menú del día. Navarra is one of a shrinking number of Spanish regions whose own tourism law still legally requires smaller restaurants to serve a fixed-price menu that includes a dessert course, and flan and natillas became the default filler for that mandatory slot, not because they are Navarra’s finest desserts, but because they are cheap to batch, hold well, and need no last-minute plating.
Losing that distinction costs the visitor something real. Order the flan on a Pamplona fixed-price lunch expecting a showcase of local pastry craft, and what actually lands on the table is frequently a legal minimum, not a curated choice, and in a large share of cases it was never made with eggs at all. It is a 1950s Spanish invention built on seaweed extract, still sold today by the same company that owns it now.
This account draws on the Real Academia Española’s own dictionary entries for both words, Navarra’s current restaurant regulation as published by the Gobierno de Navarra, cross-verified Spanish press coverage of the menú del día’s Francoist-era origins, and the corporate history published by the company that now owns Spain’s best-known packaged flan brand.
Two Words, Two Different Etymologies
The Real Academia Española traces flan to the French flan, which itself comes from the Old High German flado, meaning “cake” or “flatbread.” It arrived in Spanish as a borrowed word, the way many culinary terms crossed the Pyrenees over the centuries.
Natillas took the opposite path. RAE’s entry gives it as a native Spanish coinage: the diminutive of nata, meaning cream. There is no borrowing involved, just Spanish grammar doing what it does, shrinking “cream” down into “little cream,” or, less literally, “creamy things.” RAE also flags something most recipe writers miss entirely: in the dessert sense, “natilla” only exists as a plural. The dictionary marks it “f. pl.” Spanish speakers do not eat “una natilla.” They eat natillas, always, grammatically, whether the bowl holds one serving or ten.
That etymological split lines up with how the two desserts actually behave. Flan is a foreign-derived, formally structured dish: egg custard cooked in a caramel-lined mold, then turned out so the caramel becomes a sauce running over the top. Natillas is looser, more like what the name says, a thickened pouring cream, usually dusted with cinnamon, served in the bowl it was cooked in rather than unmolded.
A Roman Custard, a Lenten Fix, and an Import That Never Happened for Natillas
The most-repeated version of flan’s food history traces back to a Roman dish called tyropatina, a savory custard of eggs, milk, and honey seasoned with pepper rather than sugar, popularized in the recipe collection historically attributed to the Roman gourmand Marcus Gavius Apicius. During the medieval period, as sugar entered Europe, cooks in monasteries and noble kitchens began sweetening a version of this custard and calling it flado, the same word root RAE traces the modern name to. Because the dish contained no meat, it became a practical option during Lent, when Catholic fasting rules forbade meat but not eggs and dairy. The sweet, caramel-topped version that eventually crossed into French and Spanish kitchens took the name flan in Spain and crème renversée au caramel in France. This lineage is a popularized culinary history repeated by Spanish food writers and by Dr. Oetker’s own brand materials rather than a single, academically settled account, but it is consistent with RAE’s linguistic etymology and with the dish’s documented spread through French and Iberian kitchens.
Natillas has no comparable import story. Its most common origin account, repeated across Spanish cookbooks and food writing but never traced to a single documented source, credits convent kitchens: nuns using up surplus egg yolks left over after egg whites were used to starch altar linens and habits, a household-economy explanation rather than a verified historical record. What can be said with more confidence is that natillas developed as a simpler, stovetop preparation using the same core ingredients as flan (milk, egg yolks, sugar) without the caramel or the mold, typically flavored with cinnamon, lemon peel, and sometimes vanilla, and thickened gently over low heat rather than set in a water bath.
Why the Two Are a Legally Mandated Pairing on Navarra’s Menús del Día
Here is the part standard coverage of these two desserts leaves out entirely. In August 1964, Spain’s Ministerio de Información y Turismo, under the tourism minister of the era, created the “menú turístico,” a fixed-price menu that every establishment serving food and drink was legally obligated to offer. Its required composition was specific: a starter of entremeses, soup, or cream; a main of fish, meat, or eggs with a side; bread; a quarter-liter of wine, beer, sangria, or another drink; and, critically, “un postre de fruta, un dulce, o queso,” a dessert of fruit, a sweet, or cheese. A fuller 1965 ordinance kept that structure and fixed maximum prices by restaurant category, from 50 pesetas at the lowest tier to 250 at the most luxurious. Newspaper campaigns in the 1970s rebranded the concept as the “menú del día,” the name that stuck.
That national ordinance was formally repealed in 2010, after Spain had to bring its tourism law into line with EU Directive 2006/123/CE. But Spain’s autonomous communities kept the authority to regulate restaurants within their own borders, and Navarra chose to keep the obligation alive. The Gobierno de Navarra’s own Decreto Foral 56/2013, still in force, defines the menú del día in its Article 18 as “the combined offer, at a single price, of at least two courses, bread, a drink, and dessert,” and it states plainly that presenting a menú del día is mandatory for second- and third-category restaurants in the region. Pamplona’s lower- and mid-tier restaurants are not choosing, as a matter of local pride, to put a “dulce” on the table. They are complying with a standing regional law that has required exactly that dessert slot since long before most of today’s kitchen staff were born.
Flan and natillas fill that slot because they are the cheapest, most kitchen-efficient way to satisfy it. Both can be batch-made hours or days ahead, both hold in a refrigerated case without degrading, and neither requires a cook to break from the lunch rush to plate something to order. Fruit and cheese, the other two options the original 1964 wording allowed, work the same way, which is why Pamplona menús del día still rotate among essentially those four choices, decade after decade.
The Flan on Your Plate Might Not Have Seen an Egg
There is a second layer to this most visitors never learn. During Spain’s postwar rationing years, when eggs and sugar were both scarce and controlled, a chemist named Alfredo Valdés García discovered that agar-agar, a seaweed extract, could replace eggs in a custard base entirely. A Galician entrepreneur, José Ferro Rodeiro, saw the commercial potential and industrialized it, packaging the powdered mix and marketing it under an invented, deliberately exotic name: Flan Chino Mandarín, playing on the idea that a real egg flan was, at the time, a luxury as distant as China itself. The product sold so well that Ferro had two factories running in Madrid by 1951, and it became, for an entire generation of Spanish households, the only flan many people had ever eaten.
Ferro eventually sold the flan business to bankroll a plastics company that grew into a large industrial group; the flan brand itself passed through the market until the German company Dr. Oetker acquired it in 2010. It is still sold today, largely unchanged, as “Flan clásico,” and Dr. Oetker’s own product range now includes a packaged “Natillas caseras” line as well, meaning both desserts on that mandatory Navarra postre list have an industrial, shelf-stable version competing directly with the housemade one. A kitchen serving thirty menús del día at lunch, working to the price ceiling that regional law effectively still shapes, has an obvious incentive to reach for the box rather than crack eggs and caramelize sugar to order. Some do it anyway. Quality on this particular course varies more, restaurant to restaurant, than almost anything else on a Pamplona menú del día, precisely because so little of it is optional.
What Visitors Should Know
Both desserts are easy to identify on sight, once you know what to look for. Flan arrives unmolded, with a pool of amber caramel sauce spread around its base; if a menu lists it as flan de huevo or flan casero, that is often, though not always, a kitchen’s way of signaling it made the custard from real eggs rather than a packet. Natillas arrives in a bowl or glass, no caramel, usually dusted with cinnamon and, traditionally, topped with a broken Marie biscuit pressed into the surface. If the question of quality matters to a visitor, asking a server directly, “¿el flan es casero?” (“is the flan homemade?”), is a normal question in Pamplona and gets a straight answer more often than not.
Neither dessert has anything to do with San Fermín specifically. They belong to the everyday menú del día, the fixed-price lunch nearly every working Pamplonica eats several times a week, festival week included, rather than to any single fiesta tradition. That everyday, unglamorous context, a legal requirement quietly shaping a lunch table decade after decade, is the more accurate story than the one most food writing tells.
Anyone curious about Navarra’s other fixed-list desserts can look past flan and natillas to cuajada, the region’s set sheep’s-milk custard, which shows up on the same kind of menu without carrying the same legal backstory. And the ritual moment when a Pamplona table actually eats its postre, lingering after the plates are cleared, has its own name and its own history: sobremesa. That daily rhythm, the point in the day when a menú del día’s mandatory dessert actually gets eaten, fits into the broader eating schedule San Fermín runs on, festival week or not.
Frequently Asked Questions
What is the difference between flan and natillas?
Flan is an egg custard set in a caramel-lined mold and served unmolded, with the caramel running over the top as a sauce. Natillas is a looser, stovetop-cooked custard made from the same base ingredients, milk, egg yolks, and sugar, flavored with cinnamon and served in a bowl without caramel. RAE’s dictionary also treats “natillas” as grammatically plural-only in this sense; there is no singular “una natilla.”
Is natillas the same as flan?
No. They share ingredients but not technique or presentation. Flan is baked or steamed in a water bath inside a caramel-coated mold and unmolded to serve. Natillas is cooked in a pot on the stovetop and served directly in the vessel it was made in, with no caramel involved.
Why do Spanish restaurants always have flan or natillas for dessert?
Because many still operate under a legal requirement to offer a fixed-price menú del día that includes a dessert course, a rule that traces to a 1964-65 Francoist tourist-menu decree. In Navarra specifically, Decreto Foral 56/2013 keeps that obligation in force today for second- and third-category restaurants. Flan and natillas became the default dessert because both can be batch-prepared in advance and served quickly during a lunch rush.
Is the flan served in Spanish restaurants always homemade?
No. A significant share of the packaged flan sold and served in Spain today traces back to a 1950s product, invented using agar-agar instead of eggs and now owned by Dr. Oetker, that was created specifically to make flan affordable and quick to produce during a period of postwar food rationing. Asking a server whether the flan is casero (homemade) is a normal question in Pamplona.
Every article on the Encierro blog is authored or reviewed by active bull runners with direct experience in Pamplona.