Sour candy gets its mouth-puckering taste from acids added to the coating, and one of those powders can give fresh blueberries a similar treatment. Food-grade malic acid adds a tart coating to the fruit without requiring it to be turned into jam, syrup, or another dessert first.
Malic acid occurs in fruits such as apples and cherries, but it is also sold as a white crystalline powder for use in food. A small amount tossed with blueberries creates the sour coating, while a trip to the freezer changes the berries into a cold snack with a firmer bite.
Malic Acid Gives Blueberries the Sour Coating
Citric acid is another ingredient used to create sour flavors, but its sharp acidity often gets paired with granulated sugar when used as a fruit coating. Malic acid provides another route and can be used on blueberries without automatically adding sugar.
Start by rinsing the blueberries, then roll them across a clean tea towel to remove excess water. They shouldn't be dried completely. A small amount of moisture left on the skins helps the malic acid adhere instead of collecting at the bottom of the bowl.
Only food-grade malic acid should be used for the coating. The ingredient is also sold for non-food applications, so checking the package before using it on fruit matters.
Start With One Blueberry Before Coating the Batch
There's no reason to cover an entire container of blueberries before knowing how much sourness you want. Put a tiny amount of malic acid on one berry and taste it first.
If the result is too sharp, use less on the remaining fruit or combine the powder with some granulated sugar. Sweeter berries may also handle more acidity than tart berries, so the same amount won't necessarily suit every batch.
Once the balance tastes right, toss the blueberries with the malic acid in a bowl until the skins have a light coating.
Freeze the Coated Blueberries in a Single Layer
Spread the coated berries across a shallow dish in one layer before placing them in the freezer. Freezing helps the powder stay on the surface and changes the soft interior of the blueberry into a firmer, sorbet-like bite.
After they're frozen, the berries can be transferred to a freezer-safe container for storage. They're best eaten straight from the freezer.
Letting the coated blueberries thaw changes both parts of the snack that make the trick work. The berries soften and released moisture mixes with the malic acid coating, leaving them wet and sticky instead of frozen and candy-like.
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