Milk sweets
Condensed milk
Milk with much of its water removed and sugar added, sealed in tins in the 1850s and now a pantry staple worldwide.
Sweetened condensed milk is milk heated under reduced pressure to remove much of its water, then mixed with sugar, which preserves it. Sealed in tins it keeps for a long time without refrigeration. It was patented in the United States in 1856 and soon made in Switzerland too. It became a ration for soldiers and a staple in places where fresh milk was scarce.
What goes in
- Whole milk1063%, Reduced to well under half its volume.
- Sugar425%, Preserves it.
- Vacuum pan213%, Evaporates water at low temperature.
Rough parts by weight. The ring shows each input's share of the product.
Made step by step
Each drawing shows the operation for that step. Quantities and timings differ from house to house and herd to herd; this is one traditional way, in outline.
Step 1: Milk Collect and standardise fresh milk. Step 2: Boil Heat it briefly and stir in sugar. Step 3: Cook Evaporate the water under reduced pressure until thick. Step 4: Set Cool quickly while stirring so the sugar crystals stay fine. Step 5: Serve Seal in tins. Finished Condensed milk, by share.
A milk that keeps
Fresh milk spoiled quickly in nineteenth-century cities, and contaminated milk was a real problem. Gail Borden developed a way to evaporate milk in a vacuum pan and add sugar, and the American Civil War brought large army orders. A factory opened at Cham in Switzerland in 1866, and condensed milk spread through Europe and the colonies.
In world kitchens
Condensed milk is a base for sweets across the world: dulce de leche and brigadeiros in South America, key lime pie in Florida, Vietnamese iced coffee, Malaysian teh tarik and Indian milk sweets made quickly at home. Boiled in its sealed tin it turns to caramel, a practice that needs care.
Where it is used
The breeds behind it
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Sources and further reading
Original text and drawings by the EveryCow desk, written with AI assistance and checked against the sources above. The shares are a rough, illustrative ratio, not a recipe: every family and dairy makes it differently. If we have something wrong, tell us.
Photo credits on this page
The small pictures above come from Wikimedia Commons under free licences. Some are cropped to fit.
- Brown Swiss: No machine-readable author provided. Malcolm Morley~commonswiki assume, Public domain, source
- Simmental: Richard Bartz, Munich Makro Freak, CC BY-SA 2.5, source
- Holstein Friesian: Vista Alegre baserria, CC BY-SA 3.0, source