Mortar and pestle

A mortar and pestle is a set of two simple tools used to prepare ingredients or substances by crushing and grinding them into a fine paste or powder in the kitchen, laboratory, and pharmacy. The mortar (/ˈmɔːrtər/) is characteristically a bowl, typically made of hardwood, metal, ceramic, or hard stone such as granite. The pestle (/ˈpɛsəl/, also US: /ˈpɛstəl/) is a blunt, club-shaped object. The substance to be ground, which may be wet or dry, is placed in the mortar where the pestle is pounded, pressed, or rotated into the substance until the desired texture is achieved.

"Pestle" redirects here. For words with a similar spelling, see Pestel (disambiguation).

Uses

Mortars and pestles have been used in cooking since the Stone Age; today they are typically associated with the pharmacy profession due to their historical use in preparing medicines. They are used in chemistry settings for pulverizing small amounts of chemicals; in arts and cosmetics for pulverizing pigments, binders, and other substances; in ceramics for making grog; in masonry and other types of construction requiring pulverized materials. In cooking, they are typically used to crush spices, to make pesto, and certain cocktails such as the mojito, which requires the gentle crushing of sugar, ice, and mint leaves in the glass with a pestle.

The invention of mortars and pestles seems related to that of quern-stones, which use a similar principle of naturally indented, durable, hard stone bases and mallets of stone or wood to process food and plant materials, clay, or minerals by stamping, crushing, pulverizing and grinding.

A key advantage of the mortar is that it presents a deeper bowl for confining the material to be ground without the waste and spillage that occur with flat grinding stones. Another advantage is that the mortar can be made large enough for a person to stand upright and adjacent to it and use the combined strength of their upper body and the force of gravity for better stamping. Large mortars allow some individuals with several pestles to stamp the material faster and more efficiently. Working over a large mortar that a person can stand next to is physically easier and more ergonomic (by ensuring a better posture of the whole body) than for a small quern, where a person has to crouch and use the uncomfortable, repetitive motion of hand grinding by sliding.

Mortars and pestles anticipate modern blenders and grinders and can be described as having the function of small, mobile, hand-operated mills that do not require electricity or fuel to operate.

Large wooden mortars and wooden pestles would predate and lead to the invention of butter churns, as domestication of livestock and use of dairy (during the Neolithic) came well after the mortar and pestle. Butter would be churned from cream or milk in a wooden container with a long wooden stick, very like the use of wooden mortars and pestles.

Automatic mortar grinder[edit]

Since the results obtained with hand grinding are not easily reproducible, most laboratories use automatic mortar grinders. Grinding time and pressure of the mortar can be adjusted and fixed, saving time and labor.

The first automatic Mortar Grinder was invented by F. Kurt Retsch in 1923 and named the "Retschmill" after him.^[16]