Control the Heat: Maintain a gentle, steady simmer. If the mixture boils too vigorously, it may burn or separate. If it darkens too quickly, lower the heat immediately.
Do Not Cover: Leave the pot uncovered during the simmering process so the steam can escape, allowing the liquid to reduce properly.
Fixing Common Errors: If the mixture remains too liquid, return it to low heat for another 10-15 minutes. If it becomes too hard, stir in a small amount of warm milk to soften it.
Variations
Mexican Cajeta: Use goat’s milk instead of cow’s milk and add a cinnamon stick and a pinch of clove during cooking.
Coconut Dulce de Leche: Stir in ½ cup of shredded coconut during the last 15 minutes of cooking.
Chocolate Version: Stir in 2 tablespoons of pure cocoa or melted chocolate once the cooking is complete.
Coffee Infused: Add 1 tablespoon of instant coffee dissolved in a teaspoon of hot water.
Spiced: Add a cinnamon stick, a piece of orange peel, and a clove at the beginning, removing them before the end.
Storage
Store the cooled dulce de leche in airtight glass jars. It will keep in the refrigerator for 2 to 3 weeks. At room temperature, it lasts about 3 days in cool climates. For longer storage, it can be frozen for up to 3 months; thaw slowly in the refrigerator.
If the dulce de leche hardens in the fridge, gently warm it in a microwave or a bain-marie with a teaspoon of milk to restore its creaminess.
