I am no longer composting for I have woodchucks! Eating my veggie garden!
One year, I dug a hole and threw in my veggie scraps and covered it with dirt. That fall, I was looking for a place to plant daffodils and remembered what I had done in the spring with the veggie scraps. Dug a hole for the bulbs and found the dirt a rich black and the veggie scraps had totally decomposed. I have also just dug holes and or trenches and buried the scraps and that has helped to improve the soil.
Have never used a tumbler composter.