Kaffir Lime Leaves: Fresh vs. Dried

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Kaffir lime leaves are the leaves from the kaffir lime plant (Citrus hystrix), otherwise known as the makrut or leech lime. The plant produces a small wrinkly lime and aromatic leaves. These leaves are used extensively in Thai, Indonesian, and other Southeast Asian cooking to give a lemony aroma and taste. They are difficult to obtain fresh in the United States, and are often sold dried.

Kaffir lime leaves are dark green with a glossy sheen. They are often more important in Asian cuisines than the fruits. They are mainly produced in Thailand, Malaysia, Indonesia, and India. Most Asian markets in the West will stock dried kaffir lime leaves, which usually come in plastic bags that can be stored for months with little change to the leaves. It is sometimes possible to find frozen kaffir lime leaves, as well.

The main compound in Kaffir lime leaves, responsible for the deep, floral aromatics is citronellal, which makes up 80% of the leaf’s oil. It’s perfume-like aroma is not it’s only contribution! It also delivers a pungency and slightly sweet flavor that regular limes can’t deliver. This doesn’t mean, however, that there is no substitute! Kaffir lime leaves are available in three forms, fresh, dried, and frozen.

How Kaffir Lime Leave are Sold

The Best Gold Standard (Fresh): Fresh kaffir lime leaves retain the highest level of citronellal possible, making them the gold standard for using in your Thai dishes.

The Silver Medal (Frozen/Dried): In both frozen and dried forms, the volotile oils will have begun to degrade, meaning that the flavor will not be as deep. Frozen is better than dried, but dried leaves are more commonly available in the United States, especially in Asian markets. Leaves dried using newer technologies, such as a dehumidified heat pump, tend to retain their aroma better than traditional tray-dried leaves.

Note On Using Dried Leaves

If you must use dried leaves, it is best to crush them before use. Fresh leaves can be shredded, sliced, or torn, according to the individual recipe. A good substitute for Kaffir lime leaves is fresh lime zest.

You can buy fresh kaffir lime leaves online. Note that a significant number of customers say that the leaves arrive wilted and/or spoiled. Many customers, however, report the leaves arrive in good, fresh condition and have a pleasant aroma. It seems that the delivery conditions of the leaves are inconsistent. I would assume that they arrive in worse condition during the hottest months.

What if You Can’t Find Kaffir Lime Leaves?

There is a persistent culinary myth that you simply cannot substitute for Kaffir lime leaves. While it is true that no other plant perfectly replicates that specific, deep aromatic profile, you shouldn’t let a lack of leaves stop you from making a Thai curry.

The Best Practical Kaffir Lime Leaves Substitute: Regular Lime Zest

If you can’t find fresh or dried leaves, the zest of a standard grocery store (Persian) lime is your best friend. While the leaf is prized for its pungent, woody depth, the zest provides a bright, citrusy “pop” that fits the flavor profile of most Thai dishes perfectly.

Generally, about 1 and 1/2 teaspoons of finely chopped lime zest can be used in place of one kaffir lime leaf. Try one teaspoon of lime zest and 1/2 teaspoon of lemon zest, and then adjust to your taste. It won’t be an identical match, but it will deliver a fresh lime scent and citrusy flavor that adds zing and freshness to your dish.

I usually squeeze half a lime into my finished curry dish, as well. A Thai curry, to me, is not complete without some citrus.

Of course, kaffir lime is not the only citrusy flavor Thais use in curries and other dishes. Lemongrass is also an important ingredient that is often ground into curry pastes, used to flavor finished curries, or used in hot and sour soups, coconut soup, and other dishes.