First, make your mayo by adding 1 egg, salt, lemon juice, 1 cup olive oil, 1 tsp of salt and 1/2 tsp ground mustard to a jar. Blend all ingredients together using your immersion blender. If you are using a regular blender, you will want to add your olive oil in slowly. Mix all ingredients together until thick and creamy. If you have a hard time getting it thick, try adding 1/4 cup more LIGHT olive oil.