Question: What is the common ingredient in the Bourbon Lancer and the Derby cocktail?

full_context: Document 1: Old Fashioned: The Old Fashioned is a cocktail made by muddling sugar with bitters, then adding alcohol, such as whiskey or brandy, and a twist of citrus rind. It is traditionally served in a short, round, tumbler-like glass, which is called an Old Fashioned glass, named after the drink.
Document 2: Sazerac: The Sazerac is a local New Orleans variation of a cognac or whiskey cocktail, named for the "Sazerac de Forge et Fils" brand of cognac brandy that served as its original main ingredient. The drink is most traditionally a combination of
Document 3: List of cocktails: A cocktail is a mixed drink typically made with a distilled beverage (such as, gin, brandy, vodka, whiskey, tequila, cachaça or rum) that is mixed with other ingredients. If beer is one of the ingredients, the drink is called a beer cocktail.
Document 4: Gin and tonic: A gin and tonic is a highball cocktail made with gin and tonic water poured over ice. It is usually garnished with a slice or wedge of lime. The amount of gin varies according to taste. Suggested ratios of gin to tonic are between 1:1 and 1:3.
Document 5: Pink Gin: Pink Gin or Pink Plymouth is a cocktail made fashionable in England in the mid-19th century, consisting of Plymouth gin and a dash of Angostura bitters, a dark red bitters that makes the whole drink pinkish. Lemon rind is also commonly used as a garnish, with the citrus oils subtly complementing the flavour.
Document 6: Bourbon Lancer: The "Bourbon lancer" is a type of cocktail made by mixing Bourbon whiskey with Champagne. These are mixed with bitters and served on the rocks.
Document 7: French 75 (cocktail): French 75 is a cocktail made from gin, Champagne, lemon juice, and sugar. It is also called a 75 Cocktail, or in French simply a "Soixante Quinze" (Seventy Five).
Document 8: Gimlet (cocktail): The gimlet (pronounced with a hard 'g') is a cocktail made of gin and lime juice. A 1928 description of the drink was: "gin, a spot of lime, and soda". The description in the 1953 Raymond Chandler novel "The Long Goodbye" stated that "a real gimlet is half gin and half Rose's lime juice and nothing else". This is in line with the proportions suggested by "The Savoy Cocktail Book" (1930) which specifies one half Plymouth Gin and one half Rose's Lime Juice Cordial. However, modern tastes are less sweet, and generally provide for at least two parts gin to one part of the lime and other non alcoholic elements (see recipes below).
Document 9: Clover Club Cocktail: The Clover Club Cocktail is a cocktail consisting of Gin, Lemon Juice, Raspberry Syrup, and an egg white. The egg white is not added for the purpose of giving the drink flavor, but rather acts as an emulsifier. Thus when the drink is shaken a characteristic foamy head is formed.
Document 10: Derby (cocktail): The Derby is an IBA Official Cocktail composed of gin, peach bitters and mint leaves.
Document 11: Prince of Wales (cocktail): Prince of Wales is a cocktail composed by Albert Edward, Prince of Wales, later to be King Edward VII. There are several variations of the cocktail, but what they usually have in common is champagne, angostura bitters on sugar, either rye whiskey or cognac, and a liqueur.
Document 12: Old Fashioned glass: The Old Fashioned glass or rocks glass is a short tumbler used for serving tan spirits, such as whisky, with ice cubes ("on the rocks"). It is also normally used to serve certain cocktails, such as the Old Fashioned, from which it receives its name.
Document 13: Planter's Punch: Planter's Punch is an IBA Official Cocktail made of dark rum, several juices, grenadine syrup, sugar syrup, and Angostura bitters.
Document 14: Dark 'n' Stormy: A Dark 'n' Stormy is a highball cocktail made with dark rum (the "dark") and ginger beer (the "stormy") served over ice and garnished with a slice of lime. Lime juice is also frequently added.
Document 15: American Trilogy Cocktail: The American Trilogy cocktail is a variation of the classic Old Fashioned. Barmen Richard Boccato and Michael McIlroy, created the American Trilogy in 2007 while bartending together at New York’s Little Branch. This Old Fashioned-style cocktail follows the same bitters, sugar, whiskey and orange peel profile as the classic, but uses orange bitters, a brown sugar cube and one part Applejack and one part rye whiskey to change it up. As the name implies, each ingredient of this three-part cocktail represents one pillar of the Trilogy. Laird’s Bonded Applejack Brandy is the first and oldest distilled spirit in America with American rye whiskey following soon after in the late 1700s. The third pillar of this cocktail is somewhat of a mystery according to creator Richard Boccato, but is often thought to be the orange bitters because of its American Origins.
ground_truth: bitters