Sundae Suspected: Nausea, Vomiting - McDonald's, Gisors Normandie

Gisors, 27140 Normandie, France

My two children and I ate at McDonald's in Gisors this Monday, July 31, 2023 around 9 pm.
About 2 hours later my son complained of nausea and stomachache and vomited. 6 hours later my 6-year-old daughter woke up in the middle of the night with stomach pains and had several vomits!

Meal: cheeseburger, potatoes and VANILLA SUNDAE ICE CREAM, which I think is the cause of the poisoning but I am not sure. | Symptoms: Vomiting, Nausea, Stomach Pain