Barb's Mayonnaise

1 whole egg
1/2 C corn or sunflower oil
salt
Place those ingredients, in order, in a 2 - 3 C container. Using a hand blender, on top speed blend 20 - 30 sec. without moving the blender. Then slowly move the blender up the cup then back down. It should begin to thicken. Add lemon, vinegar or garlic to taste then mix again.
If it begins to curdle, add milk.