Vietnamese Caramel Sauce - Nước Màu (2 ingredients)
Nước Màu lends a gorgeous caramel hue to numerous Vietnamese dishes. While you can find it in many Asian markets, it's even easier to make at home with just two ingredients: sugar and water.
Combine sugar with 2 tbsp water in a stainless steel pot (using stainless steel makes it easier to monitor the color).
Set the heat to medium-high and patiently wait for the mixture to start bubbling, typically around 5-7 minutes. Keep a close watch on it.
Once the mixture begins to turn golden-orange or amber, indicating caramelization has begun, gently swirl the pot to evenly distribute the syrup. Avoid stirring to prevent sugar crystallization.
When the syrup reaches a rich brown color, remove it from the heat and carefully add 1/4 cup of water (and optionally, lime juice or vinegar). Be cautious as it may splash violently.
Stir the sauce until well combined, then simmer over medium-low heat for another one or two minutes to slightly thicken it.
Allow the sauce to cool for a bit before transferring it to a jar for storage. As it cools completely, the caramel sauce will thicken further.
Notes
You can use palm sugar, brown sugar, black sugar, or even rock sugar to make Nước Màu.
You could substitute water with coconut water, pineapple juice, or even Coke, Sprite, and 7-UP.
Here are some tips to avoid sugar crystallization:
Don't stir the mixture while cooking; instead, gently swirl the pot to distribute the syrup evenly.
Towards the end, add a splash of vinegar or lime juice.
If your sugar does crystallize, just add some water to dissolve the sugar, and you can continue cooking it.