Can an 'AGA oven' be koshered?
Here are Wikipedia and video explanations of what an AGA oven is. Here's an excerpt from the Wikipedia page:
The AGA cooker is a heat storage stove and cooker, which works on the principle that a heavy frame made from cast iron components can absorb heat from a relatively low-intensity but continuously-burning source, and the accumulated heat can then be used when needed for cooking.