The Book of Yields is a comprehensive collection of accurate food measurements: weight-to-volume equivalents, trim yields and cooking yields for over 900 practical foods. The foods are scratch items, not pre-prepped, frozen or convenience foods, whose weights or portion yields are already stated on the package. The foods are categorized by type: dry or fresh herbs, vegetables, fruit, flours, rices, meats, poultry, etc. The measures used for each type of food reflect the ways that that particular type of food is normally measured in recipes. For instance, the Dry Herbs section states how many tablespoons of each herb or spice are in 1 ounce or how many individual pieces (cloves or peppercorns for instance) are in 1 Tablespoon and/or in 1 ounce. Produce items state the trim yields as both a weight and a percentage of the original weight plus they state how many cups of a trimmed and cut fruit or vegetable are obtained from the original weight and what one cup, trimmed weighs.