Garlic

Garlic (Allium sativum) is one of the most widely used culinary plants on earth — and one of the oldest recorded medicinal herbs. A member of the onion family alongside shallots and leeks, garlic grows in virtually every climate zone and has been cultivated for thousands of years. Its characteristic pungency comes not from the bulb itself, but from sulfur compounds released the moment a clove is cut, crushed, or chewed.

What gives garlic its distinctive smell and health properties?

When a garlic clove is broken open, an enzyme called alliinase converts a compound called alliin into allicin — the sulfurous molecule responsible for garlic's sharp aroma. Allicin is short-lived; it breaks down within minutes, but its metabolites (including diallyl disulfide and s-allyl cysteine) persist in the body and are thought to drive many of garlic's observed effects. These sulfur compounds are absorbed through the digestive tract and circulate widely, which helps explain why garlic appears to act systemically rather than locally.

A single raw clove contains meaningful amounts of vitamin C, manganese, selenium, and vitamin B6 relative to its size. It is low in calories and contributes trace amounts of calcium, phosphorus, and copper.

What are the main health benefits of garlic?

The health literature on garlic is substantial, though researchers are careful to distinguish between association and causation. The most consistently reported findings include:

• Immune support: Regular moderate consumption is associated with fewer and shorter episodes of the common cold in some clinical trials.
• Cardiovascular health: Garlic may help reduce LDL cholesterol and mildly lower blood pressure, particularly in people with hypertension.
• Antioxidant activity: The sulfur compounds and vitamin C content contribute to reducing oxidative stress in cells.
• Anti-microbial properties: Allicin has demonstrated antibacterial, antifungal, and antiviral effects in laboratory studies, which underpins its long history in folk medicine for skin and digestive ailments.
• Athletic performance: Preliminary research suggests garlic may reduce exercise-induced fatigue, though evidence in humans remains limited.

Most nutrition researchers suggest one to two fresh cloves per day as a reasonable amount for functional benefit, without risking digestive discomfort that larger doses can cause.

How has garlic been used throughout history?

Garlic's medicinal use predates written records, but the earliest documented references appear in ancient Egyptian texts — workers building the pyramids reportedly consumed it to maintain stamina. Babylonian, Greek, Roman, and Chinese physicians all recorded garlic as a treatment for everything from infections to intestinal parasites. The Greek physician Hippocrates prescribed it for pulmonary complaints, while Roman soldiers carried it as a general tonic.

In Ayurvedic medicine — still widely practised in Sri Lanka — garlic (lasuna in Sanskrit) is classified as a warming herb used to support digestion, circulation, and respiratory health. Products combining garlic with local ingredients such as bee honey reflect this tradition directly. Sri Lankan preparations like lunu dehi (lime pickle) often incorporate garlic as both a flavouring and a preservative.

How is garlic used in cooking around the world?

Garlic is a foundational flavour in cuisines across South Asia, the Middle East, the Mediterranean, East Asia, and the Americas. Its culinary applications range from raw preparations, where the flavour is sharp and assertive, to long-cooked dishes where it mellows into something sweet and nutty.

Common forms include:

• Fresh cloves: Sliced, minced, or crushed for curries, stir-fries, soups, and marinades.
• Garlic powder and dehydrated flakes: Used in spice blends, dry rubs, and processed foods including salad dressings and snack coatings.
• Garlic paste: A convenient base for South Asian cooking; combined with ginger paste in many Indian and Sri Lankan recipes.
• Garlic oil: Infused oils used for finishing dishes, in sauces, and in canned food manufacturing.
• Pickled garlic: Whole cloves preserved in brine or vinegar; a condiment with its own distinct, mellower flavour profile.
• Garlic in honey: A traditional Ayurvedic preparation that combines garlic's compounds with honey's antimicrobial properties.

In Sri Lanka, garlic appears in nearly every savoury dish — from everyday dhal and coconut milk curries to spice pastes for fish and meat preparations. It pairs naturally with Ceylon black pepper, another island spice with a long history in both cooking and traditional medicine.

What garlic products are made in Sri Lanka?

Sri Lanka produces a range of value-added garlic products that reflect both local culinary traditions and growing interest in functional foods. These include:

The island's spice industry — historically centred around cinnamon, pepper, and cloves such as Syzygium aromaticum — has expanded significantly into processed garlic products for both domestic consumption and export markets.

How should garlic be stored and prepared for maximum benefit?

Fresh garlic keeps well at room temperature in a dry, well-ventilated spot for several weeks. Avoid refrigerating unpeeled bulbs as humidity encourages mould. Once peeled or chopped, cloves should be used promptly or stored in an airtight container in the refrigerator for no more than a few days.

To activate the highest concentration of allicin, crush or finely chop the clove and let it rest for around ten minutes before applying heat. This gives the enzyme reaction time to complete. High heat applied immediately after cutting reduces allicin formation significantly, which matters if you are using garlic for its functional properties rather than purely for flavour.

For those who find raw garlic too pungent, black garlic — whole bulbs fermented at low heat over several weeks — delivers a sweeter, more complex flavour with a different but still significant antioxidant profile.