Water is sometimes avoided when blending pastes to prevent diluting the flavor, altering the texture, or causing the paste to spoil more quickly. Using oil or another liquid base can help preserve the paste's desired consistency and shelf life.
When creating pastes, the choice of liquid significantly impacts the final product. Water, while readily available, can introduce several issues. Firstly, it can dilute the concentrated flavors of the ingredients, resulting in a less potent paste. Secondly, water can change the texture, making the paste too thin or watery, which might not be desirable for certain applications. Thirdly, water-based pastes are more susceptible to microbial growth, leading to faster spoilage.
Instead of water, cooks often use oil (like olive oil, vegetable oil, or sesame oil), vinegar, or even alcohol as a blending agent. Oil, for example, helps to emulsify the ingredients, creating a smoother and richer paste. It also acts as a preservative, extending the shelf life of the paste. Vinegar can add a tangy flavor and also helps in preservation. The choice of liquid depends on the specific ingredients and the intended use of the paste. For example, pesto often uses olive oil, while some curry pastes might use a combination of oil and vinegar.
When making a paste, add the liquid gradually. You can always add more liquid to thin it out, but it's much harder to thicken a paste that's already too watery. Start with a small amount and blend until you achieve the desired consistency.