Get ready: Preheat your oven to 300 degrees. Line a baking (cookie) sheet with parchment paper, and set aside. Fit your electric mixer with the whisk attachment. Remove eggs from fridge, separate out the whites, and allow to warm to room temp (about 5 minutes).
In your mixer bowl, beat egg whites together with salt until glossy peaks form.
Slowly add in the sugar, and continue whipping until stiff peaks form. Turn off mixer, remove bowl.
Sprinkle vinegar, cornstarch, extract, and food colouring (if using) over meringue, gently fold in till combined.
Heap meringue onto the center of your baking sheet.
Use a spatula to spread the meringue out to an egg shape.
Put the baking sheet into your oven, and turn the temperature down to 250 degrees. Bake for 1 hour and 20 minutes.
Once your timer goes off, turn the oven off and let the meringue cool in the oven for several hours. The baking of the meringue can be done the day before, if needed!