What must be done with liquid ingredients before processing?

• A. They should be heated to boiling before use.
• B. They should be stored in a separate container.
• C. They should be kept under direct light.
• D. They must be filtered to remove extraneous matter.

Answer: (D)

The essential idea is ensuring liquid ingredients are free of unwanted particles before they enter processing by filtering out extraneous matter. Filtering removes dirt, hair, sediment, and other physical contaminants that could spoil product quality, clog equipment, or cause uneven texture and heat transfer later on. Heating to boiling isn’t universally appropriate because it can alter taste, texture, or safety requirements for many liquids. Storing in a separate container and keeping liquids under direct light aren’t universal pre‑processing requirements and can even be detrimental (light can degrade some ingredients). Filtering provides a practical, broadly applicable step to maintain cleanliness, safety, and consistency in the final product.