Drink coffee or can get it in bulk from a coffee shop? A great, fun way to recycle used coffee grinds, filters and all! Comes with a starter culture. Just fill any container (with a lid) day after day with your grindage and soon you will be cooking up some tasty oyster mushrooms to celebrate your willingness to help the environment! Detailed directions included. Perfect for breakrooms and employee lounges where this culture can be mixed in periodically into a paper and coffee composting bucket, which will eventually fruit and produce edible oyster mushrooms! Also a great gift for any occasion.