Yuzu, Calamansi and Specialty Citrus

Lemon and lime cover most drink recipes, but a wider citrus shelf adds aromas they cannot match. Yuzu smells of mandarin, grapefruit and flowers all at once. Calamansi is tart with an orange-skin perfume. Sudachi, Meyer lemon and bergamot each bring something distinct, and a little of any of them can transform a familiar sour.

This guide describes the specialty citrus you are most likely to find, how much juice each gives, how to use bottled juices, and how to blend them with lemon or lime so the result is balanced rather than overpowering.

Yuzu and yuja-cha

Yuzu is an East Asian citrus about the size of a tangerine, with a bumpy yellow skin, many seeds and little juice. Its aroma is the reason to use it: floral, piney and somewhere between mandarin, grapefruit and lime. The juice is quite sour, close to lemon in acidity.

Fresh yuzu is seasonal and expensive outside Asia, so most people use bottled juice. Pure juice is best for drinks; some bottles contain salt for cooking, which can work in a margarita-style drink but will surprise you in a sweet sour. Korean yuja-cha, a marmalade of yuzu peel and sugar, makes a quick hot or cold drink.

Calamansi

Calamansi, common in the Philippines and parts of Southeast Asia, is a small round citrus with green-to-orange skin and orange flesh. It tastes like a sour mandarin crossed with lime, with a fragrant peel. Each fruit gives only a teaspoon or two of juice.

Use it fresh in limeades, iced tea and rum or gin sours, or look for frozen pure calamansi juice in Asian grocery stores. Its juice can darken and lose aroma quickly, so squeeze close to serving.

Other citrus worth knowing

These fruits appear seasonally in specialty markets or online, and each brings a distinct note. Treat them as accents and blend them with a reliable base citrus.

• Sudachi and kabosu: small green Japanese citrus, tart and herbal; good with whisky highballs and shochu
• Meyer lemon: sweeter, less acidic, with a thin, fragrant skin; reduce the syrup when you use it
• Key lime: small, seedy and more aromatic than a Persian lime; use like lime in sours
• Finger lime: oblong with juice vesicles that pop like caviar; best as a garnish
• Bergamot: intensely floral and bitter, the scent in Earl Grey; use peel and a little juice
• Makrut lime: the leaves are the useful part; juice is scant and bitter

Swapping into a recipe

Specialty citrus varies widely in acidity and sweetness, so measure and taste. Replace about a third of the lemon or lime in a sour with the new juice to start. If the drink tastes too sweet, the fruit was less acidic than lime; add a little more lemon or lime, not more specialty juice.

For drinks where aroma matters more than tartness, use the peel. A strip of yuzu or bergamot peel expressed over a gin and tonic changes the whole drink without altering its balance.

• Yuzu: up to half the citrus in a sour
• Calamansi: up to all the lime, adjusting sugar
• Meyer lemon: all the lemon, minus 5 ml of syrup
• Bergamot: a few milliliters of juice plus the peel

Buying and storing

Choose fruit that feels heavy for its size with firm, fragrant skin. Store whole specialty citrus in the refrigerator crisper, where most keep a week or two. Squeezed juice should be refrigerated and used the same day for best aroma, or frozen in small portions.

Opened bottled juice belongs in the fridge; follow the label's use-by guidance. Fresh-squeezed juice is unpasteurized, so for very young children, older adults or anyone with a weakened immune system, pasteurized bottled juice is the safer choice.

Common questions

Can I substitute lemon for yuzu?

Lemon gives the acidity but not the aroma. Mix lemon juice with a little fresh grapefruit or mandarin juice and a strip of mandarin peel for a closer approximation.

Why does my bottled yuzu drink taste salty?

Some yuzu juices sold for cooking contain salt. Look for 100 percent juice for drinks, or reduce other salty elements and add a touch more syrup.

Is calamansi the same as a kumquat?

No. They are related and similar in size, but calamansi has a loose, thin skin and sour, juicy flesh, while kumquats are usually eaten whole, skin and all.