The man in the Indian state of Madhya Pradesh is said to have been given the sweet - a traditional dessert called rasgulla - by a neighbour on Tuesday.
The bomb, used by some people to kill wild boar, was offered to the man. It exploded in his mouth, police officer Rekha Singh told AFP.
The 35-year-old man was rushed to hospital with serious injuries, but died there.
Two men have been arrested and charged with causing death.
“We do not know if the motive was to kill,” Singh said.
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