If you are provided with some vegetables to cook. You generally add salt into the vegetables during cooking process. After adding salt, vegetables release water. What mechanism is responsible for this?

On adding salt in the vegetables, then the concentration in the outer medium increases than the inside medium. This makes the external medium hypertonic because of which exosmosis occurs and vegetables release water.
*Hypertonic solutions: In hypertonic solutions, the concentrations of dissolved solutes are greater outside the cell resulting in the low concentration of water outside. Thus, to maintain an equilibrium, the water will flow from inside to the outside, causing the cell to shrink.