1) Put the meat in a bowl, add salt and pepper and mix with black truffle oil and black truffle powder.
2) Make 4 circular hamburgers 160gr each.
3) Take the onion and cut into julienne and cook it in a pan and deglaze a small glass of cognac.
4) Cook the burgers as your personal taste and add the cheddar.
5) Cut the bread and spread the black truffle paté inside, put the hamburger between the bun and complete with onion and mayonnaise on the top and serve.
Put all the ingredients in a glass and blend everything (medium speed) with an immersion blender. from the bottom upwards, until the compound will be well emulsified and yellowish reached the consistency of the mayonnaise.
