This is top-quality Italian olive oil that has been infused with black truffles. (Truffles have an earthy, mushroom-like flavour.) 

Which to choose? Black or White? 

In choosing which truffle oil to use, black or white, you should consider the recipe and other ingredients. Black truffles have a stronger taste, so black truffle oil is a good choice to go with meats, sauces, casseroles. White truffles are usually not cooked, and have a lighter, more refined taste, so white truffle oil is better with eggs, pasta with cheese, risottos and dishes where it will be added after the cooking is completed, such as drizzled over tomatoes and fresh mozzarella cheese.