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.
Cooking weights and measures world, which has a 15 mL metric tablespoon. In Europe, older recipes frequently refer to "pounds" (e.g. "Pfund" in German, "pond" in Dutch, "livre" in French). In each case, the unit refers to 500 g, about 10% more than an avoirdupois pound (454 g). Dutch recipes may also use the "ons", which is 100 g. With the advent of accurate electronic scales it has become more common to weigh liquids for use in recipes, avoiding the need for accurate volumetric utensils. The most common liquids used in cooking are water and milk, milk weighing approximately the same as water in