“Improving” a cocktail does not necessarily mean making it better. The term simply means something was added to the traditional combination of spirit, sugar, water, and bitters associated with an Old Fashioned style cocktail. In this case, Charlotte “improves” this tequila Old Fashioned by adding Maraschino and two types of bitters.
Have you ever thrown a cocktail? Not at someone. FOR someone. Throwing a cocktail is another way to mix a cocktail for your guests by “throwing” the ingredients back and forth from mixing glass to tin. Charlotte Voisey demonstrates this technique while making her Unusual Negroni cocktail.