To Make Traditional Egg Yolk Mayonnaise:

1 large egg yolk, save white for later use
3 teaspoons freshly squeezed lemon juice
1/4 teaspoon salt, plus more to taste
1/2 teaspoon smooth dijon mustard (not whole grain)
3/4 cup canola oil

To Make Egg White Mayonnaise:

1 large egg white, save yolk for later use
3 teaspoons freshly squeezed lemon juice
1/4 teaspoon salt, plus more to taste
1/4 teaspoon dry mustard (like Colman's)
1/2 cup canola oil