What Is Malt Flavor?

Malt is cereal grain, usually barley, that has been soaked until it sprouts and then dried with hot air to stop it. Sprouting builds enzymes that turn the grain's starch into sugars such as maltose. Kilning then sets the color and the flavor. Malts run from very pale through crystal and amber to chocolate and black.¹

So "malt flavor" is not one taste. It is a range, from soft bread-crust sweetness to coffee-dark roast. When people say "malty" in a shake or a candy, they mean the pale, sweet end.

Where the flavor comes from

Raw barley smells grassy. In one study that tracked barley through malting, the grassy compounds stayed through sprouting. Kilning then produced Maillard compounds with malty and roasted notes, led by a malty aldehyde called 3-methylbutanal.²

Maltol is named after malt. It smells of caramel and is sold on its own as a flavor enhancer.⁴

Where people meet it

Malted milk. James and William Horlick developed malted milk in the 1870s and 1880s. It is malted barley, wheat flour and evaporated whole milk. Stirred into ice cream it made the "malt" that gave malt shops their name. It is also the center of malted milk balls, and it is in malted drinks such as Ovaltine and Horlicks.⁵

Malt drinks. Malta is a lightly carbonated, non-alcoholic malt beverage brewed from barley, hops and water. It is popular in the Caribbean and parts of South America.⁶

Non-alcoholic beer. In alcohol-free beer, the malt's aldehydes play a key role in the flavor, and maltsters are modeling the kiln to control them.³

Diastatic vs non-diastatic malt powder

The two look alike. They do different jobs.

King Arthur suggests ½ to 1 teaspoon of diastatic malt per 3 cups of flour.⁸ Non-diastatic malt is high in maltose, which feeds the Maillard reaction and browns the crust.⁷

If you want malt flavor, you want non-diastatic. Diastatic enzymes will thin anything thickened with starch.

Using malt flavor in a product

Check the allergens. Barley malt contains gluten. A food made with it cannot be labeled gluten-free unless the ingredient is processed to remove gluten and the food tests below 20 ppm.⁹ Malted milk powder also brings wheat and milk.

For gluten-free, build it. A compounded malt-type flavor can use maltol and the malty aldehydes without the grain. Malted quinoa is another route. In the same study, kilned quinoa was also high in 3-methylbutanal.²

It loves heat. Malt flavor is made by heat, so it holds up in baking far better than fruit or citrus. See heat stability.

Pair it with chocolate and vanilla. That is the malted milk ball, and the classic malt shake. Vanilla rounds it. Caramel and butterscotch sit right next to it; see butterscotch vs caramel.