1Dice potatoes, making sure all are relatively the same size. Place in a large saucepan add the salt, and cover with hot water. Bring to a boil over medium-high heat and then reduce heat to maintain a rolling boil. Cook until potatoes are tender throughout when poked with a fork.
2Heat the half-and-half, butter and the garlic in a medium saucepan over medium heat until simmering. Remove from heat and set aside. Remove the potatoes from the heat and drain off the water. Mash and add the garlic-cream-butter mixture, grated Asiago and truffle oil. Stir to combine.
3Let stand for 5 minutes so that mixture thickens and then serve.