Place egg whites, sugar and cream of tarter into a heatproof bowl of an electric mixer.
Set over a saucepot with simmering water.
Whisking continuously until sugar is dissolved and egg whites are warm to the touch, 3-4 minutes.
Transfer bowl to electric mixer fitted with the whisk attachment, add vanilla and begin beating egg mixture on low speed, gradually increasing to high, until stiff glossy peaks form.
Approx. 6-7 min.
Top chilled pie with fluff.
Using an offset spatula or the back of a spoon, gently lift and twirl fluff to create peaks.
Carefully using a kitchen torch, gently brown Marshmallow fluff to resemble roasted marshmallows.