First off the bat, chill all of your ingredients and major components. Your Gin can live in the freezer until you've drank it all, while the Campari and Vermouth can happily dwell in the fridge. In addition, pop your glass and mixing jug in the freezer 10 minutes before you plan to use them
Remove the mixing jug from the freezer and fill it half way with fresh ice
Add 35ml London Dry Gin, 30ml Sweet Vermouth, and 30ml Campari. Then smoothly stir for around 15 seconds
Take your lowball glass from the freezer and add a big lump of the finest ice you can get your hands on. Then gently strain the Gin, Vermouth and Campari mix over it, being careful not to agitate the liquid
Cut a coin-sized piece of Orange Peel, hold it between your thumb and forefinger with the Orange part facing the glass and bending inwards. Fire up a lighter, hold it about 2cm in front of the peel, then give it a light squeeze. You should see some small flames jump out as the Oils in the Orange Peel catch fire
After 1 or 2 seconds, extinguish the flame, then run the freshly flambéed Orange Peel around the rim of the glass before setting it aside
Garnish the drink with half a slice of Orange, then sit back and sup on your freshly made Negroni