Parents, What is the sweetest revenge you got on your child's bully?

I (30F) have a daughter (8F) who went to a prestigious school. I am a professional chef so when I make breakfast for my daughter before going to school I try my best to make it like restaurant.

A while back I noticed that my daughter was coming home tired from before and hungrier than before.Being a mother I focused on a balanced diet for my daughter. I knew something was wrong so i took my daughter to the doctor. Doctor said that the reports were normal and the only reason this might be happening is because my daughter hasn't been eating her meals.

On the way home. I asked my daughter about this first she refused to speak anything but after bribing her with ice cream she finally told me that a bully in her school jesica had been eating her lunch.

The next day i went to school and then to jesica's parents each one said that they would do something about it but by the following week there was no change. I knew I had to do something.

My friend used to work in the same school as nurse. I got some in depth details of jesica's life apparently she was lactose intolerant.

I knew my next plan. On monday I made a special dish which had milk in it in huge amount but when you ate it you couldn't tell if it was water or milk. Jesica being a greedy eater again stole my daughter's lunch and ate it. Within few minutes she started an allergic reaction and had to be hospitalized after I Almost killed her.

After that jesica never stole any other kids lunch.