The menu includes salads with olives, capers and pine nuts; gluten-free bread with nut-based butter or olive tapenades; smoked salmon with herb dressing; and other various meat and fish dishes.

The survey found most gluten-free products in supermarkets – such as gluten-free bread and biscuits – are higher in fat than the equivalent standard products.

These recipes use precise mixes of non-wheat-based, gluten-free flours that only the baker need know are allergy safe.