This is actually a common scare for parents when their kids suddenly pee in a different color, and later they find out they had a strong colored food at school, or at a friend's place.
Don't do this, but I read online about some chemist getting pranked by his daughter putting Prussian blue in his coffee, turning his urine blue to blue-green.
It was also a minor plot device in one particular episode of MAS*H
Charge Nurse gets an anguished phone call early morning, at home, from the female overnight staff. She was terrified that she was haemorrhaging.
Charge Nurse asked her to remember what they did yesterday.
"We harvested lots of veg from the garden, we cooked lots of beetroot and we ate lots of beetroot"
Pee went red. No issues.