Yes, urad dal paste can be stored with a thin layer of oil on top to help prevent oxidation and spoilage, extending its shelf life.
Urad dal paste, like many other food preparations, is susceptible to spoilage due to oxidation and microbial growth. When exposed to air, the surface of the paste can darken and develop an undesirable flavor. A layer of oil acts as a barrier, preventing air from reaching the paste and slowing down these processes.
Here's how to properly store urad dal paste with oil:
Ensure the urad dal paste is freshly prepared and of good quality.
Transfer the paste to a clean, airtight container. Glass or food-grade plastic containers are suitable.
Pour a thin layer of oil (about 1/4 inch) over the surface of the paste. Use a neutral-flavored oil like vegetable oil, sunflower oil, or canola oil.
Seal the container tightly and store it in the refrigerator. Properly stored, the paste can last for several days to a week longer than if stored without oil.
Always use a clean spoon to scoop out the urad dal paste from the container. Avoid introducing any contaminants that could accelerate spoilage.