Pumpkins are fall personified. From that rich, orange hue to its pride-of-place at not one but two massive holiday events, there’s not a single fruit or veg that owns its season like the pumpkin.

What If You Couldn’t? What if you had a food allergy, and your body’s immune system overreacts to what should be a harmless food protein? A reaction can be as bad as life-threatening anaphylaxis. This ...