You can also seed them, sauté in butter, add lemon juice, brown sugar, cinnamon/allspice/nutmeg and use them in a crisp or cobbler. Mimics apple crisp with the tartness from the lemon and spices. Delicious!
That blows, IMO you shouldn't have been fired, you did all that was possible to prevent that situation. The responsibility was hers for what she put into her mouth, even if she couldn't read, walnuts are evident in Waldorf.