Ingredients:
10 liters of whole milk
7 kilograms of white sugar
500 grams of unsalted butter
2 teaspoons of baking soda (optional, helps prevent curdling)
Instructions:
- Combine Milk and Sugar: In a large, heavy-bottomed pot, pour the whole milk and add the white sugar. Stir the mixture over medium heat until the sugar is fully dissolved.
- Bring to a Boil: Increase the heat slightly to bring the mixture to a gentle boil, stirring continuously to prevent sticking or burning.
- Simmer and Reduce: Once boiling, reduce the heat to low. Add the unsalted butter and baking soda (if using), stirring well to incorporate. Allow the mixture to simmer gently, stirring occasionally, for approximately 3 to 4 hours. During this time, the liquid will reduce, and the mixture will thicken to a creamy, light golden color.
- Monitor Consistency: As the mixture reduces, monitor its consistency. It’s ready when it has thickened to the texture of commercial sweetened condensed milk.
- Cool and Store: Remove the pot from heat and let the sweetened condensed milk cool. Once cooled, transfer it into sterilized jars or airtight containers. Store in the refrigerator for up to 2 weeks or freeze for longer preservation.
Note: This large-batch recipe is ideal for commercial purposes or large gatherings. Ensure you have a sufficiently large pot to accommodate the initial volume and allow for safe boiling. Stirring occasionally during the simmering process prevents the mixture from sticking to the bottom of the pot and ensures even thickening.