Fruits and vegetables contain about 80-95% water. To make them crispy, it's essential to force the moisture out. Conventional methods like deep-frying use high heat ranging from 170-190ºC to evaporate the moisture from the ingredients. However, this high temperature isn't necessary with vacuum frying. Vacuum frying involves cooking food at low pressure and temperature, which reduces oil content, enhances flavor, and retains more nutrients compared to traditional frying methods.