I didn’t know until recently that there are people who are intolerant of Onions, Garlic, Leeks, Chives and Spring Onions. It must be very difficult to find the safe food for them because those vegetables are very popular and used for many dishes. Finely chopped Onion is most likely added to the meat patties. Do you know finely grated Daikon (White Radish) is a good alternative? Particularly for Port patties. You won’t taste it, but Daikon creates soft texture and the patties taste good.