Wash the peaches thoroughly and pat dry with paper towels. Cut them in half, remove the pits, and set aside.
Heat your cast iron pan inside a wood fired oven or outdoor grill until properly hot. Add the oil and coat the surface evenly. I used grapeseed oil because of its high smoke point, though avocado oil, peanut oil, clarified butter, or sunflower oil all work equally well.
Carefully remove the hot pan and place the peaches cut side down onto the surface.
Return the pan to the heat and roast for about four to six minutes.
Remove the pan (wear thick heta proof gloves)and carefully flip the peaches over to expose the now beautifully golden caramelized edges. At this stage be prepared for the lovely perfume of roasted peaches filling the air.
In a small bowl whisk together the brown sugar, lemon juice, sea salt, maple syrup, and orange extract until smooth.
Drizzle or brush the glaze generously over the peaches.
As I mention in the video, the orange extract can easily be replaced with Grand Marnier and adding a bit of vanilla extract or ground cinnamon works beautifully as well.
Place the pan back into the oven and continue roasting for another three to five minutes. Keep a close eye on the tops so they do not burn.
Rotate the pan occasionally to ensure even color and proper caramelization.
Remove from the heat and serve immediately.
If using a conventional indoor oven simply set it to 425°F and adjust cooking time accordingly, particularly during the finishing stage where it may take slightly longer than cooking over direct high heat.