Gently mist the inside of a rocks glass with about 4 sprays of orange blossom water. Set aside.
To a mixing glass filled with ice, add 1 ounce of Scotch whiskey, 1 ounce of Campari, and 1 ounce of sweet vermouth. Stir with a bar spoon until chilled.
Strain into the misted rocks glass.
Garnish with an orange twist.