Fresh ginger-garlic paste offers a brighter, more pungent flavor and aroma compared to store-bought versions, which often have a milder, sometimes slightly metallic taste due to preservatives and aging. Functionally, fresh paste provides more intense flavor impact in cooking.
The primary difference lies in the freshness and quality of ingredients. Fresh ginger-garlic paste is made from freshly ground ginger and garlic, retaining their volatile oils and aromatic compounds. These compounds are responsible for the vibrant and complex flavor profile. When you grind fresh ginger and garlic, you release enzymes that create new flavor compounds, resulting in a more intense and nuanced taste.
Store-bought ginger-garlic paste, on the other hand, is often mass-produced and contains preservatives like citric acid or vinegar to extend its shelf life. These preservatives can alter the flavor, making it less vibrant and sometimes slightly sour or metallic. Additionally, the ginger and garlic used in commercial pastes may not be as fresh as what you would use at home, leading to a weaker flavor profile. The paste may also have been sitting on the shelf for an extended period, further diminishing its flavor.
In terms of function, fresh ginger-garlic paste provides a more potent flavor base for your dishes. You might need to use a larger quantity of store-bought paste to achieve the same level of flavor intensity as a smaller amount of fresh paste. The fresher paste also tends to blend more seamlessly into sauces and marinades, contributing to a smoother and more cohesive final product.
If you're using store-bought ginger-garlic paste, consider adding a pinch of freshly grated ginger and minced garlic to boost the flavor and mimic the taste of fresh paste. This can help compensate for the loss of volatile oils and aromatic compounds in the store-bought version.