Ingredients:

1 1/2 ounces Scotch Whiskey 
1/2 ounce sweet vermouth 
1 dash orange bitters 

Preparation:

Stir with cracked ice. Strain into chilled cocktail glass. Garnish with lemon twist. Also known as: Santiago Scotch Plaid Bitters: Orange bitters was an original ingredient for this drink, but with this often being difficult to find Angostura bitters can be used instead.