1-1/4 cup of light olive oil, divided
1/2 teaspoon mustard powder
1/2 teaspoon salt
1/2 to 1 lemon, juiced
•Place the egg, 1/4 cup of olive oil, mustard powder, and salt in a mixing bowl, blender, or food processor. Mix thoroughly.
•While the food processor or blender is running (or while mixing in a bowl with a stick blender), slowly (very slowly!) drizzle in the remaining cup of olive oil.
•After you’ve added all the oil and the mixture has emulsified, add lemon juice to taste, stirring gently with a spoon to incorporate.