Mint Leaves

Mints are aromatic, perrineal herbs that grow in Europe, Asia, Africa and America and since natural hybridisation of different Mint ( Mentha ) species are common, there are many hybrids and cultivars across the planet. Along with the mint, peppermint, spearmint and cornmint are known cultivars used regularly in condiments, foods and drinks. The fresh or dried mint leaf is the source of the mint flavour and aroma and is known to have several health benefits and has been used traditionally as a medicine for stomach ache, chest pain and headache, heartburn and diarrhea too. In drink making mint leaves or mint sprig is used as a garnish and is intended to provide that cool, menthol note to the nose, with spearmint being the most common mint in use a garnish.

Blackberry Brandy

Blackberry Brandy is created by infusing fine brandy with sun ripened blackberries. This is a delicious brandy and goes well with ice cream and cocktails as well as a straight drink, best enjoyed after dinner.

Blackberry brandy has several health benefits too, which includes its use as a cure for diarrhea. The high tannin content of blackberries tighten tissues and alleviates hemorrhoids, relieves intestinal inflammation. Blackberry brandy is high on antioxidants which help eliminate the free radicals in our body.

It also contains vitamin C, a byproduct of the copper pot stills used in the distillation process, Vitamin C helps prevent several diseases like Scurvy and Gout and boosts the immune system.

Orange Curacao Liqueur

Curaçao is a liqueur flavored with the dried peel of the bitter orange laraha. It's been a popular liqueur for more than 150 years, the Dutch East India Company created this orange liqueurs by steeping orange peels in alcohol from the island of Curaçao and called it Curaçao liquor, unlike Triple Sec, Curacao has added spices and herbs to the orange and Curaçao comes in a variety of colours such as clear, orange or blue.

Blue Curaçao being the most used of them, in cocktails. Although Curacao is an orange tinted liquor, Blue Curacao is a regular Curacao dyed bright blue to give it a striking appearance, and thus is a very popular cocktail mixer, whenever a striking colour is desired.

Blue Curacao is usually around 25% ABV.

Blue Curacao is essentially Orange Liqueur tinted Blue, the colour doesn't influence the taste and thus Orange Curacao is interchangeable with Blue Curacao in recipes, if the colour is not important in the appearance.

NOTE: Blue Curacao being an Orange Flavoured Blue Liqueur, it's primary purpose in a cocktail is introducing the Orange flavour and the striking sky blue to the drink, so, if a bottle of Blue Curacao liqueur is something you are not planning to buy right now, you can manage with the Blue Curacao Syrup.
It would add the same flavour and colour profile to the cocktail, all we need to do is simply count for the alcohol absent in the syrup and account for it.

Bourbon Whiskey

American's don't need to be lectured on Bourbon, but still, let's put it in record like all other spirits. A Bourbon in American spirit is a barrel-aged distilled liquor made primarily from corn. The name might have been derived from the French Bourbon dynasty, or from Bourbon County in Kentucky, or Bourbon Street in New Orleans, both named after the French Dynasty.

Technically, most whiskey made in America are legally classified as Bourbon, although Bourbon is in spirit a Southern Whiskey with special connection to Kentucky. Note than although Tennessee Whiskey is classified as Bourbon, Tennessee distilleries do not prefer their whiskey to be unique and referred to as Tennessee Whiskey only.

Distilling came to Kentucky in the late 18rth Century with the Scots, Scot-Irish and other settlers including English, Welsh, German and French, and they brought with them their distilling techniques and ageing processes in charred oak barrels. The charring is what gives the Bourbon the brownish colour and distinctive taste.

To be a legal Bourbon, a whiskey has to meet the following criteria

Produced in the United States and Territories (Puerto Rico) and the District of Columbia
Made from a grain mixture that is at least 51% corn
Aged in new, charred oak containers
Distilled to no more than 160 (U.S.) proof (80% alcohol by volume)
Entered into the container for aging at no more than 125 proof (62.5% alcohol by volume)
Bottled (like other whiskeys) at 80 proof or more (40% alcohol by volume)

Angostura Bitters 2es

Angostura Bitters is a concentrated bitters based on gentian, herbs and spices, from the House of Angostura in Trinadad and Tobago. Note that the Angostura Bitters from the House of Angostura do not contain Angostura bark.
However, Angostura Bitters or Angobitter offered by other brands like Riemerschmid and Hemmeler, contain angostura bark, possibly to justify using the word "Angostura" in their names.