Moisture generally makes mincing easier because it helps ingredients bind together, preventing them from scattering and allowing for cleaner cuts. Dry ingredients tend to crumble and resist forming a cohesive mass.
The presence of moisture in an ingredient significantly impacts how easily it can be minced. When an ingredient contains sufficient moisture, the individual pieces tend to cling together. This cohesion allows the knife blade to slice through the entire mass more efficiently, resulting in a finer and more uniform mince. Think of mincing a moist onion versus trying to mince dried herbs. The onion's natural moisture allows it to be easily chopped into small, even pieces.
Conversely, dry ingredients lack this binding property. When you attempt to mince a dry ingredient, it tends to crumble and scatter, making it difficult to achieve a fine and consistent mince. The knife blade simply pushes the dry particles around rather than cutting through them cleanly. This is why rehydrating dried ingredients before mincing is often recommended.
The type of moisture also matters. Natural moisture within the ingredient is ideal, but adding a small amount of liquid, such as water or oil, can also improve the mincing process for drier ingredients. The added liquid acts as a binding agent, helping the particles adhere to each other and facilitating cleaner cuts.
If you're struggling to mince a dry ingredient, try lightly misting it with water or oil before you begin. This small amount of added moisture can make a significant difference in the ease and quality of the mince. Be careful not to add too much, as excessive moisture can make the ingredient mushy.