Mustard (condiment) glucosinolates in mustard plant varieties, and the different isothiocyanates that are produced, make different flavors and intensities. Prepared mustard condiment may also have ingredients giving salty, sour (vinegar), and sweet flavors. Turmeric is often added to commercially prepared mustards, mainly to give them a yellow color. Prepared mustard is sold in glass jars, plastic bottles, or metal squeeze tubes. Because of its antibacterial properties, mustard does not require refrigeration for safety; it will not grow mold, mildew, or harmful bacteria. Mustard can last indefinitely without becoming inedible or harmful, though it may dry out, lose flavor, or brown from oxidation.
Pressure cooking frying under pressure, because ordinary pressure cookers are not suitable for pressure frying. Pressure cooking Pressure cooking is the process of cooking food, using water or other cooking liquid, in a sealed vessel known as a "pressure cooker". This simulates the effects of long braising within a shorter time. Almost any food that can be cooked in steam or water-based liquids can be cooked in a pressure cooker. The cooker works by trapping the steam produced from boiling the cooking liquid inside the vessel. This causes internal pressure and temperature to rise quickly. After use, the steam is slowly released