In A Deep Bowl, At High Speed Of An Electric Mixer, Beat The Egg Until Thick And Lemon Colored. Add Sugar, Salt, Dry Mustard, Paprika And Pepper. Mix Well. Add One Cup Of Oil In A Small Pencil Stream, Beating Until Mixture Begins To Thicken. Add Lemon Juice, Mixing Well. Add Remaining Oil, In A Thin Streambeating On High Until Mixture Is Thick. Add Water, Mixing Well. Spoon Mayonaise Into Glass Or Plastic Container; Cover Tightly And Chill.