How To Make Mayonnaise

Ingredients:
1 cup oil of choice
1 egg yolk
1 to 2 Tbsp lemon juice or vinegar
Pinch of salt
Water to thin the mayonnaise

Instructions:

1. Add egg yolk and vinegar to mixing bowl (or food processor) and whisk together.
   
2. Add oil very slowly, in a steady stream while you are whisking vigorously (or the food processor is running).
   
3. If the mayonnaise starts looking too thick, add enough water to thin it to the consistency you desire.  Add about a teaspoon of water at a time.  When the oil is all mixed in, the mayonnaise should be thick and fluffy, with your whisk forming ribbons through the mixture.
   

Notes:

• This recipe is based on Making Mayonnaise from allrecipes.com.  It also has a video demonstration.
• According to allrecipes.com, if it never thickened and you’re stirring a puddle, chances are you will need to start over. (Or, if you’re still partway through the process, you can save the emulsion by adding another egg yolk, whisking vigorously. Add in remaining oil, plus extra for a double recipe), and adjust the seasonings.
• This recipe contains egg yolk lecithin.  MRT tests soy lecithin.  If you are reactive to soy lecithin, you may or may not be able to tolerate egg lecithin.
• An alternative recipe/demonstration is Alton Brown's Mayonnaise.
• An alternative recipe/demonstration is WikiHow's How to Make Mayonnaise.