Split the body into 2 parts
1 part can be dissolved by acid, the other by a base (not really dissolve but break down), I don’t know which specific body parts belong to which but they do exist
Once that’s done, mix them back together
Acid and base neutralize eachother, creating water, the rest of the ‘body’ becomes an unrecognizable sludge
Iirc, best stuff to put onto that ground are moss, azaleas and mushrooms, as they really like decomposing matter
If you do that in a forest, it could even pass as a place a buried stump was left at