What food would you serve if you were planning on poisoning your foes?
Poisoned poisson.
I'd serve them a creme egg filled with mercury.
I would poison a river near a castle while laughing like I'm totally disturbed.
Five pounds of Crack Cocaine.
Making them their favourite foods with trace amounts of arsenic. Eventually it builds up in their body and...
Pee in their soup ?
"Steak and kidney pie", obvs.
putting ricin in the rice.