How can you get Monster Broth in Monster Hunter 3?

Do u mean how to find monster broth then i can tell u. You gotta kill vespoids and they will drop it i think u gotta play high rank.

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one more way is to use poison to kill those Vespoids.

they are very succeptible to it so bring some Poison Bombs, Poison shots, Poison Coatings or any poison elemented blademaster weapons. carve the remains of those pesky pests by pressing "O" on their remains.

you'll get some of it easier rather than the suggestion on the top or buying one worth 5000 from granny.