Peel the garlic cloves and cut into large pieces. Wash the basil and carefully pat dry with a kitchen roll.
Put the egg (room temperature) in a tall container. Then add the garlic, basil, mustard, spices and balsamic vinegar. The oil then comes on top. Dip the hand blender into the vessel and slowly pull it up at the highest speed.
Store leftovers in a cool place and use within two days.