Preheat the oven to 350F.

Fry the bacon in a cast iron skillet (or oven safe pan) until crispy.

Remove the bacon with a slotted spoon, leaving the bacon fat. If you have particularly lean bacon you might like to add a little olive oil at this point. Add the radishes and turn to coat in the fat and/or oil. Season generously with salt and pepper.

Roast for 20 minutes or until nearly fork-tender. Add the shredded cheese and the cooked bacon. 

Return to the oven for 5 minutes or until the cheese has melted and the bacon has warmed through. 

Garnish with the green onions, but let cool at least 5 minutes before serving - the water content in the radishes retains a lot of heat!