I try to accommodate those with allergies. I tell them to call me the day before or the morning of their visit. I have a regular on Fridays who is allergic to pepper. We have the same menu every Friday of Fried chicken, a fish dish, mashed and gravy, etc. I hold some gravy and potatoes and a fish portion with no pepper. He wrote a note to the board of directors of the restaurant thanking me and the restaurant. Another who is allergic to blue cheese who I look out for (I make a few dishes with blue cheese)..it is just good
PR IMHO. But liability? No as long as nothing is misrepresented, the chef is not a doctor if the person's allergies are life threatening they should be responsible enough to find out what the food they are eating contains before they eat it.