Great-Grandma's old fashioned mayonnaise recipe is a tangy cooked mayonnaise made with brown sugar, dry mustard, eggs and apple cider vinegar. Cooked slowly on the stovetop until thick, it's especially good on leftover turkey sandwiches.
Add the brown sugar, flour, dry mustard powder, eggs and salt to a saucepan and mix together.
In a separate bowl or measuring cup, combine the water and apple cider vinegar.
Add enough of the water-vinegar mixture to the saucepan to make a smooth, soupy paste.
Gradually stir in the remaining water-vinegar mixture.
Cook over low heat, stirring constantly, until the mayonnaise is thick enough to coat the back of a spoon and reaches at least 74°C (165°F). Approximately 12 minutes.
Remove from the heat and cool. The mayonnaise will thicken further as it cools.
Transfer to a covered container and refrigerate within 2 hours. Use within 3 to 4 days.
Notes
The finished mayonnaise is brown, tangy and noticeably thicker after cooling.
A skin may develop across the surface as the mayonnaise sits.
Great-Grandma's original instructions allow the consistency to be adjusted with additional flour for a thicker mayonnaise or additional water-vinegar mixture for a thinner one.
I have successfully used a cornstarch slurry instead of flour, but I consider that a modern substitution rather than part of the inherited recipe.
Don't substitute prepared yellow mustard for the dry mustard without expecting the consistency and flavour to change.
The cooking time can vary. Use the spoon-coating consistency and safe internal temperature rather than relying on a fixed number of minutes.
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