Peanut Oil

Peanut oil has a favorable fatty acid profile: approximately 46-49% oleic acid (monounsaturated), 30-33% linoleic acid (polyunsaturated), and modest saturated fat. Oleic acid has been associated with reduced LDL cholesterol and improved cardiovascular markers in multiple studies.

Unrefined peanut oil contains meaningful amounts of vitamin E (tocopherols), which function as antioxidants both in the oil and in the body. Some research has also identified resveratrol in cold-pressed peanut oil, the same stilbenoid found in red wine and associated with anti-inflammatory and cardioprotective effects.

Refined peanut oil is relatively resistant to oxidation at cooking temperatures due to its monounsaturated fat content, producing fewer harmful oxidation byproducts than oils higher in polyunsaturated fats when used at high heat.

The peanut originated in South America and was carried to West Africa and Asia by Portuguese traders in the 16th century. In China, it was adopted rapidly across Shandong, Guangdong, and other provinces, and peanut oil quickly became the dominant cooking fat in many regional cuisines. Shandong cooking in particular, considered the foundation of northern Chinese culinary tradition, relies on peanut oil for its iconic stir-fried and braised preparations.

In West Africa, groundnut oil became similarly central. It is the traditional fat for many Ghanaian and Nigerian stews, lending a gentle richness to groundnut soups that have sustained communities for centuries. Colonial-era trade routes brought peanut cultivation to the American South as well, where peanut oil became associated with deep-frying, particularly in Southern cooking and later popularized for frying turkeys.

In India, groundnut oil (moongphali ka tel) is a staple across Gujarat and Maharashtra — each regional tradition developed its own relationship with the oil, yet all converge on the same core quality: reliable high-heat performance and clean flavor.

In Chinese wok cooking, peanut oil is heated until it just begins to smoke before aromatics are added. This ensures the wok is hot enough for proper searing and prevents ingredients from steaming instead of frying. The oil's mild character lets garlic, ginger, and chili aromatics express themselves clearly without competing. It is equally valuable for deep frying: its high smoke point means food cooks quickly at the surface, resulting in a crisp exterior and less oil absorption.

Beyond high-heat applications, peanut oil works beautifully in dressings, cold noodle sauces, and marinades. Cold-pressed varieties contribute a gentle nuttiness to sesame-adjacent sauces and can partially replace sesame oil where a less intense but still rounded flavor is desired. In satay sauce and some dan dan noodle preparations, a small quantity of peanut oil unifies and enriches the sauce.

For wok cooking: heat the wok dry over highest heat until it begins to smoke slightly, then add peanut oil and swirl to coat. Add aromatics immediately and proceed with the stir-fry. This sequence is essential for wok hei.

For deep frying: maintain oil between 350-375°F (175-190°C); use a thermometer and fry in small batches to prevent temperature drop.

Store peanut oil in a cool, dark place; refined versions keep up to a year, cold-pressed varieties up to 6 months. Refrigeration is not necessary but extends shelf life in warm climates.