If you build a huge kiln then you can just toss it in. But then you have all of this heavy ugly material lying around. That shit drives me nuts. It will make better char though.

My go too for a few years was 6 foot radius cone dug in the ground which made excellent char. Same issue here, you have to chunk up everything to fit.

You can make a big rectangular pit, but then you have a pit and a lot of work. Now you can make biochar in it for a few years then start back filling it with kitchen waste and whatever you want once filled maybe cover crop it for a year then plant. That would be an excellent strategy.

In my opinion open top burn pile with wood mostly dried creates good char for the least effort. The purest and environmentalists are not going to be happy.