Can I cook with this walnut oil?

You can, but it's important to understand how heat affects unrefined, cold-pressed oils like this one. The primary value of this oil is its gentle nutty aroma and flavor, which is more prominent because it hasn't been refined or heavily processed. For this reason, it works best as a finishing oil added to dishes just before serving, such as drizzled over salads, cooked grains like quinoa, roasted vegetables, or soups.

If you wish to use it with heat, very gentle warming is acceptable—think of warming it slightly to mix into a sauce or to lightly sauté vegetables on low heat. It is not suitable for high-heat cooking methods like frying, searing, or baking at high temperatures. Intense heat can degrade the oil's delicate compounds, diminishing its flavor and potentially creating smoke. For high-heat cooking, a neutral oil with a higher smoke point is a more practical choice.

In short, treat it as a flavorful accent rather than a primary cooking fat. Store it in a cool, dark place to help maintain its quality.