If you think cheese fondue is an ancient Swiss peasant tradition, you may have fallen for one of the most successful food marketing campaigns of the 20th century. This deep dive unpacks the surprising history, the delicate chemistry and the cartel that turned melted cheese into a national symbol.

We look at the earliest printed fondue recipes, why real Alpine peasants could not afford Gruyere, and how cornstarch, wine acids and precise temperature keep the emulsion stable. Then we follow the Swiss Cheese Union’s campaign tying fondue to national unity, the leap to New York with fondue bourguignonne and chocolate fondue, and the science of the heavy cheese brick feeling after the meal.

• Why the first recognized cheese-and-wine fondue recipe was not published until 1875
• How chelation and cornstarch stop melted cheese from separating into grease and rubber
• How the Swiss Cheese Union invented regional fondue recipes to move surplus cheese
• How Konrad Egli created chocolate fondue to promote Toblerone
• Why drinking kirsch or wine slows digestion while black tea may be the better choice