Salt draws out moisture from food

When salt comes into contact with the surface of food, it creates a concentration difference between the inside and outside of the cells. To balance this, water is drawn out from within the food through osmosis. Therefore, after sprinkling salt, home cooks often notice the ingredient's surface becoming wetter as moisture is released.

Experienced cooks often leverage salt's moisture-extracting property to bring out the full flavor of dishes. For instance, when preparing salads with root vegetables, sprinkling salt before cooking helps remove excess water and reduces the food's pungent or astringent taste. In traditional fermented dishes like pickled vegetables, salt also helps vegetables release water, creating a natural fermentation environment that makes the dish crisp and preserves it longer.

However, adding salt too early can sometimes alter a dish's texture. When stir-frying green vegetables, adding salt at the beginning often causes them to release water quickly, lowering the pan's temperature and making the vegetables soft and less crisp. Similarly, when stir-frying shrimp or meat, seasoning too early can cause the meat to release its juices. This reduces the conditions for the Maillard reaction, which creates the brown color and rich aroma when food is exposed to high temperatures.

Sugar retains moisture and tenderizes ingredients

In contrast to salt, sugar binds with water in food, slowing down moisture loss during cooking. Used in moderation during marination, sugar helps meat fibers retain moisture better, resulting in a softer and juicier texture after cooking.

Beyond its moisture-retaining ability, sugar plays a crucial role in caramelization. At high temperatures, sugar turns brown and develops a distinctive aroma. Consequently, grilled, braised, or stewed dishes often achieve an appealing amber color and richer flavor with an appropriate amount of sugar added early on.

In many familiar dishes such as braised pork, braised ribs, grilled meat, and stewed pork, cooks often add a little sugar during marination. Sugar not only balances the saltiness of fish sauce and salt but also contributes to a glossy and more aromatic surface on the dish after cooking.

Everyday kitchen applications

Applying the "salt separates, sugar retains" principle, many experienced chefs and home cooks adjust their seasoning timing to ensure delicious, full-flavored dishes. When stir-frying green vegetables, salt should be added near the end to limit excessive water release. For pan-seared or quick-fried meats, seasoning with fish sauce and salt occurs after the meat has seared.

Conversely, when marinating meat for grilling or stewing, a small amount of sugar helps tenderize the meat and creates a beautiful color when cooked. This principle, however, is not always rigid. Its effectiveness also depends on the type of ingredient, the amount of seasoning, and the cooking temperature.

Understanding the distinct effects of salt and sugar empowers cooks to adjust seasonings proactively, thereby preserving the crispness of vegetables, the juiciness of meat, and the balanced flavor of a dish. This is why these two common seasonings are always carefully considered for their timing and quantity in various cooking techniques.

Bui Thuy