What would be the best substitute for chicken in this recipe? I'm making it for someone who is deathly allergic to chicken.

Don't know your timing, and this may be too late.
Other ideas:
1) veal, if you eat it and can find humanely raised meat
2) other birds (if the allergy isn't to all fowl or poultry):
* turkey
* grouse
* quail
* squab
* pheasant

Hi Laura! You could replace the chicken with pork (maybe tenderloin?) or simply leave it out and add extra sausage and shrimp to the dish.