1 whole egg
1/2 tsp. salt
1/4 tsp. dry mustard
2 tbsp. lemon juice
1 c. salad oil

Break egg into blender, add mustard and salt. Beat with 2 or 3 tablespoons of oil until it starts to thicken, add a few more drops of oil. As mixture begins to thicken add oil in larger quantities, but not too quickly. Then beat in the lemon juice.