A 5gal bucket, half way filled with wood chips, saw dust (I get it from my local Amish saw mill, $1 for 3 50lbs bags), cover waste with the bio-mass.
Empty into a compost pile. Let breakdown over 2 years.
Large enough compost pile, you can breakdown a animal over time.
Buried a chicken in the compost pile. Turning it over a few months later, found what was left. The meat was cooked. The pressure from the pile, and the breakdown action generated heat.
Makes great compost.