Acid, such as lemon juice, is crucial in rice-based salads like lemon rice because it brightens the flavors, balances the starchiness of the rice, and acts as a preservative.
Acid plays several key roles in rice salads. First, it provides a necessary counterpoint to the often bland and starchy flavor of cooked rice. The tartness of lemon juice, vinegar, or other acidic ingredients awakens the palate and prevents the salad from tasting heavy or monotonous. Second, acid helps to balance the other flavors in the salad, such as spices, herbs, and vegetables, creating a more harmonious and complex taste profile. In lemon rice specifically, the lemon juice is the star, providing the signature tangy flavor. Finally, acid acts as a natural preservative, inhibiting the growth of bacteria and extending the shelf life of the salad, especially important if it's being served at room temperature or outdoors. The acidity helps to keep the rice grains separate and prevents them from clumping together, resulting in a better texture.
Add the acid (lemon juice, vinegar, etc.) towards the end of the preparation. Adding it too early can sometimes 'cook' delicate ingredients or dull the overall flavor profile over time. Taste and adjust the acidity right before serving for the best results.