A man out for a Father's Day dinner was left feeling sick to his stomach after a nasty added "ingredient" on his burger order at a New York beer garden.

Curtis May asked to see the order after it got mixed up.

Scanning through it, May saw all the ingredients he asked for, but the additional item on his receipt left him feeling sick: a topping of "spit".

The order for his chicken burger read: "Cheddar, Well done, toast bread, please spit in it too!"

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May had already finished his burger when he read the food order.

"I ate my burger already, I felt like I was gonna throw up," Mays recalled to ABC 11 of the shocking end to an otherwise lovely evening with his daughter and granddaughter.

"I asked her [the server] 'Why would you do this?' And she couldn't explain it. She said she didn't do it, so I was like 'Who prints out the receipt?' She said, 'I take it up there and print it myself'. 'So you did it? Why are you lying about it?' She just walked off," he said.

Mays immediately approached the manager.

One New York man left his Father's Day dinner feeling sick after discovering instructions on the receipt for his burger that said
One New York man left his Father's Day dinner feeling sick after discovering instructions on the receipt for his burger that said "please spit in it too." Photo / Getty

"He was saying, 'How can we compensate you?' I was like, 'How can you compensate somebody for spitting on your food? I ate this already'," the patron said.

Mays added that the waitress was fired on the spot and he received a refund.

The manager told WABC that he had never had a problem with the employee before and although food service was a stressful job, the behaviour was unacceptable.

The manager added it was very unlikely a cook actually spat in the burger, but he understood why the customer is upset.

According to the outlet, the Bohemian Hall and Beer Garden has an "A" rating from the New York Department of Health.