I served the food that fell on the ground
I can't believe you'd do this. Why would you serve the food that fell on the ground?
I don't like to waste food and it was only on the ground for 5 seconds.
It is wrong to serve people food that fell on the floor. You could cause them injury or illness if they eat it.
It's just a little dirt there. The worst thing that could happen is that someone gets diarrhea.
If someone gets sick from your restaurant they will blame your restaurant and give it bad reviews.