- STEP 1
Place the egg yolk in a large bowl, put the mustard in the bowl and mix.
- STEP 2
While whisking continuously gradually add the oil. Don't let it curdle, if it does you will have to start from scratch!
- STEP 3
Once all the oil has been added. Add the vinegar, salt and pepper
- STEP 4
To serve I like to finely chop up chives and sprinkle on top.