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Gather ingredients including 1 egg yolk, 1 cup oil, 1 tsp mustard, 1 tbsp vinegar or lemon juice, and a pinch of salt.
Then make sure everything is at room temperature so that the emulsion forms properly.
Now in a bowl whisk the yolk and mustard until smooth and slightly thickened.
Then drizzle the oil very slowly while whisking constantly to start the emulsification.
Gradually when the mixture thickens add oil a bit faster and whisking continuously.
Now add vinegar or lemon juice at the end for enhanced flavor and also to stabilize the mayo.
Then add seasoning and store the mayo in the airtight container in the fridge for up to week.