Great for simple sandwiches like roasted chicken, avocado and tomato, or as a dip for steamed artichokes. Also use it as a base for adding garlic, blue cheese or fresh herbs. You can store it in the fridge for 2 to 3 days.
In a medium bowl, slowly but firmly beat the yolks with a whisk until creamy and light yellow in color. Add half the lemon juice, then the mustard and salt, and combine well.
In a small bowl, mix the oils, then very slowly drizzle them into the yolk mixture, whisking constantly. (Be careful not to overbeat.)
Stir the rest of the lemon juice into the mayonnaise, then cover and refrigerate for at least 2 hours before using.