Slice oranges in half and juice the orange, reserving both the rinds and the fresh squeezed juice.
Keep the orange peel to one side and burn the hell out of it. Use a blowtorch or a gas stove to get charred bits on the peel and release the natural oils. For a gas stove, remove the burner plates and turn the heat to medium high. Using tongs or heat resistant utensils, slowly roast the skin side of the orange peels until charred. Set aside and repeat until all 4 halves are charred.
In a medium pot, weigh the orange juice, and add equal parts sugar. Add the burnt orange peels, peel side down into the mixture and heat gently on low for 15 minutes. Ensure the mixture does not boil, but the sugar dissolves. Use a spatula to stir and check no sugar grains remain (be careful tasting as it will be extremely hot).
(Optional) Leave the mixture overnight with the peels in the syrup for extra potent orange flavor.
Pour into an airtight container like a mason jar and seal tightly. Keep in a cool space out of direct sunlight for future use.