How to Make an Emerald Cocktail For a cocktail made with traditional Irish whiskey, this Celtic wonder is a twist on the classic Manhattan. Replacing Angostura bitters with orange bitters, the Emerald cocktail bucks the trend of garish green drinks for St Patrick’s Day. Ingredients: 50ml of Irish Whiskey 25ml of Sweet Vermouth 2 Dashes of Orange Bitters Method: Add the ingredients into a Mixing Glass filled with ice Stir gently to combine Strain into a glass Garnish with Orange Peel