1 egg (room temp)
1 teaspoon dry mustard
1 teaspoon salt
1 1/4 cup vegetable oil
dash cayenne pepper
3 tablespoons lemon juice or vinegar

Place egg, mustard, salt, cayenne pepper and 1/4 cup oil
in blender and blend on low. While the machine is blending,
SLOWLY pour in another 1/2 cup oil. You may have to stop
and scrape down the mayo. Add the lemon juice/vinegar and the
remaining 1/2 cup oil. Blend until well combined.
Store in refrigerator.