Comfrey Tea for Tomatos

I'm making a comfrey compost tea for the tomatos. It was all the talk of an allotment list I subscribed to years ago, they swore by it. I've been cutting comfrey and stuffing it into a kitty litter bucket with a lid held down by bricks. After a few weeks a yeasty sluge forms, you add water and wait a few weeks and it's ready to pour around the tomatos.