Preheat the oven to 180°C fan / 200°C conventional / 400°F.
Melt the butter in a frying pan over medium heat. Add the sliced red onion and cook gently for 5-7 minutes until softened.
Sprinkle over the brown sugar and continue to fry for another 2 minutes.
Pour in the red wine vinegar and let it bubble until the onions turn glossy and sticky. Remove from the heat.
Cut a circle in the top of the cob, slightly larger than the camembert. Lift off the “lid”, then hollow out some of the bread inside to create a snug cavity. (Keep the torn-out bread for dipping later.)
Spoon the caramelised onions into the bottom of the cavity.
Remove the camembert from any plastic wrapping and wooden base. Sit the cheese on top of the onions.
Score the camembert in a cross-hatch pattern, drizzle generously with honey, and sprinkle over the dried thyme.
Place the stuffed loaf on a baking tray and bake for 25 minutes, or until the cheese is molten and the bread is lightly crisp.
Whilst it's baking, fry the pancetta cubes over medium-high heat until golden and crisp, around 10 minutes.
Remove the camembert from the oven. Top with crispy pancetta cubes, an extra sprinkle of rosemary or thyme, and another drizzle of honey. Serve immediately, letting everyone tear off pieces of bread and dip into the melted cheese.
The video below will help with this recipe.