Vermicompost produced by worms fed organic vegetable material. Worms don't literally eat the material — they secrete enzymes onto it, biology breaks it down, and the worms slurp the processed slurry. The result is 'black gold' — humic-rich compost with highly bioavailable nutrients.
Jeremy compares freshly harvested castings from his home worm bin to bagged BuildASoil castings, showing the bag is darker and more finished but the fresh ones carry more live biology.
Discussed in: Ep 001 · Ep 003 · Ep 006 · Ep 007 · Ep 014 · Ep 027