Malt is made from barley and was originally a primary ingredient in beer (malt-based beers are some of the only ones I'll drink - I prefer them to hops-fermented ones), and later whiskey. Barley is partially sprouted and then dried and ground to create malt. In the 19th century it also became an industrial baking product, helping to give sweetness and a nice crust to breads. But in the 1870s, British pharmacist James Horlicks was trying to come up with an alternative food to raw milk for infants and a nutritional supplement for invalids. Milk at the time was rarely pasteurized and could often infect children with diseases. Lacking funds, he emigrated to Racine, Wisconsin, where his younger brother already lived. By the 1880s the brothers had patented a fortified gruel that they dried and ground, containing malted barley, ground grains, and dried milk. Developed as a water-soluble food for infants, it was quickly adopted in both tropical climates and polar expeditions for its shelf stability, palatability, and nutritional content. Horlick's brand malted milk became the industry standard and was adopted by the Temperance movement as well, showing up in soda fountains and in ice creams.
In 1927, Carnation launched its own brand of malted milk and soon chocolate options were available on the market as well. Ovaltine, a malted milk powder that originally also contained eggs, was developed in Switzerland in the 1900s (originally with the name "Ovomaltine"). By the time we get to White Christmas in 1954, malted milkshakes, including chocolate malts, were a fixture of diners and soda fountains (and, apparently, trains) everywhere.
Today, Carnation is one of the few malted milk powders widely available, and that's what I used. They also had a recipe for malted milkshakes right on the back of the container.
Vanilla Malted Milkshakes
2 scoops vanilla ice cream
3/4 cup whole milk
teaspoon vanilla extract
3 tablespoons malted milk powder
Place all ingredients in a blender and blend until smooth.
This did make a very good milkshake - the ratio of ice cream to milk was just about perfect. Although it was maybe a little more liquidy than I like, it didn't get ice crystals, as you sometimes do with homemade milkshakes. That being said, three tablespoons of malted milk powder is a LOT, and resulted in a very strong malted milk flavor. If you're unsure of how fond you are of malted milk, I would cut it down to two tablespoons.
This makes about 12-16 ounces, so make sure to pour it into a tall glass and top it with whipped cream.
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