Greek yogurt, also known as concentrated or strained yogurt, is made by
eliminating the whey and other liquids from regular yogurt.
This is because the straining process reduces the total volume, Greek
yogurt takes significantly more milk than regular yogurt to make a batch
of the same size.
Traditionally, the
yogurt is strained in cloth bags up to three times until it reaches the
desired texture.
Modern production methods
use centrifuges to achieve the same effect.
Some companies may use thickening agents or other dry ingredients, in which case the final product is referred to as
fortified or Greek-style yogurt. Because most of the
liquid is removed, Greek yogurt is much thicker and tangier than regular
yogurt. It’s also generally more expensive since it requires more milk.