Final answer:
The selection of cooking oil is crucial when eliminating all allergens from a dish, as it is part of the overall ingredients and could contain or be contaminated with common allergens.
Step-by-step explanation:
True: When aiming to eliminate all allergens from a dish, the selection of cooking oil is indeed important as well as the main ingredients.
Those with food allergies must be careful about the entire composition of a dish, which includes cooking oil. Some oils may be derived from allergenic sources, such as soy, peanuts, or sesame, which are common allergens. If a dish claims to be allergen-free, it must consider all potential sources of allergens, including cross-contamination risks. For example, a label stating that a product is made in a facility that also processes items with gluten, milk, soya, celery, sulfites, and their derivatives suggests that there is a risk of cross-contamination, which must be considered when preparing an allergen-free dish. In commercial settings, specifically mentioning allergens is a legal requirement in many regions to ensure consumer safety. Therefore, caution is imperative not just in choosing the main ingredients but also in selecting items like salad dressing, beverages, and especially cooking oils, considering their production process and potential for cross-contamination.