The following points should be included in a specification you design for a product:

Ingredients

Recipe

Weight and volume

Nutritional values

Quality standards

Techniques to be used

Hygienic procedures

Packaging requirements

Product life

Display requirements

REMEMBER in an exam if you are asked to write a specification BE SPECIFIC. Give example don't just say the product must be healthy, say the product must be healthy so the sugar content should be kept as low as possible