Yes, sesame oil should be shaken before each use to redistribute any sediment that may have settled at the bottom, ensuring a consistent flavor and texture.
Sesame oil, especially toasted sesame oil, often contains small particles of sesame seeds or sediment that naturally settle over time. These particles are harmless and contribute to the oil's rich flavor. However, if you don't shake the bottle, the first few uses might be less flavorful, while the last few uses could be overly concentrated with sediment, leading to an inconsistent taste in your dishes. Shaking the bottle ensures that these particles are evenly distributed throughout the oil, providing a consistent and balanced flavor profile with every use. Think of it like orange juice with pulp – you shake it to get the pulp evenly distributed for the best taste.
If you notice a significant amount of sediment even after shaking, it might indicate that the sesame oil is old or has been stored improperly. Consider purchasing a fresh bottle to ensure the best flavor and quality.