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Its flavored oil that mimics the aroma/taste of truffles. And is made with base oils like olive/grapeseed oil infused with either synthetic flavorings or real truffles.
Here are some differences and similarities between the two types of truffle oils.
White truffle oil is made to taste like white truffles, while black truffle oil is all about black truffle flavor. Simple.
Both oils are typically produced using synthetic flavorings due to the difficulty of capturing the natural flavor of truffles and their high cost.
The intensity of flavor varies based on quality and concentration of truffle flavoring used, with black truffle oil generally having a stronger taste.
White truffle oil has a garlicky, musky aroma with earthy undertones, while black truffle oil has a stronger, woody, and earthy aroma with hints of chocolate and mushroom.
The appearance of both oils is similar in color, often due to the use of synthetic flavors and not real truffles.
If both oils are made with synthetic flavors, the price might be similar. If made with real truffles, white truffle oil will be much more expensive.
Both oils are used as finishing oils. White truffle oil is recommended for milder truffle taste in delicate dishes, while black truffle oil provides a stronger flavor.
Both truffle oils are commonly found online and in gourmet food stores. Oils made with real truffles, especially white truffle oil, can be hard to find.
Both types of oils have a similar shelf life, with oils made from real truffles having a shorter expiration date.
See the link below to get the full comparison along with all the useful tips.