3/4 c. cooking oil
1 egg plus water to make 1 c.
1 tbsp. lemon juice
1/2 tsp. dry mustard
2 tsp. salt
1/2 c. sugar
2/3 c. flour
1 c. water
1/2 c. vinegar

Beat thoroughly in a blender the oil, egg and water to make one cup, lemon juice, dry mustard and salt. Cook the flour, water and vinegar in a sauce pan. Bring to a boil, then blend into first mixture. Beat hard until smooth.