As an expert sommelier and brewer, I can provide you with a detailed answer to your question about whether milkshakes historically contained alcohol.
In the early days, milkshakes were indeed made with alcohol. They were known as whiskey milkshakes and were considered to be a sturdy and healthful eggnog-type drink. These whiskey milkshakes were often served as a tonic as well as a treat. The ingredients typically included eggs, whiskey, and other flavorings.
However, by the year 1900, the term “milkshake” had evolved to refer to wholesome drinks made with syrups such as chocolate, strawberry, or vanilla. These milkshakes did not contain alcohol and were enjoyed by people of all ages, including children.
It is interesting to note the transition of milkshakes from an alcoholic beverage to a non-alcoholic treat. This change in the composition of milkshakes may have been influenced by various factors such as changing societal norms and the increasing popularity of non-alcoholic beverages.
Personally, I have not encountered milkshakes with alcohol in my professional experience as a sommelier and brewer. However, it is worth mentioning that there are modern variations of milkshakes that incorporate alcohol as an ingredient. These alcoholic milkshakes are often enjoyed in bars or restaurants that cater to adult customers looking for unique and indulgent beverage options.
To summarize, while milkshakes originally contained alcohol in the form of whiskey, they eventually evolved into non-alcoholic beverages made with flavored syrups. However, in recent times, alcoholic milkshakes have emerged as a trendy and indulgent drink option for those seeking a more adult twist on this classic treat.