1egg yolk (room temperature) if you prefer, use a hard boiled egg yolk
1hard boiled egg yolk
1generous tspdijon mustard
2lemons juiced and one zested
1-2tbspwhite wine vinegar optional
about 300ml olive oil (room temperature)
1generous tbspchopped fresh herbs, parsely and mint, tarragon and chives or dill.
1 or 2anchovies, finely choppedoptional
2tspsmall capers (½ tsp finely chopped)
2spring onions - finely sliced
½-1tspsalt
Instructions
Zest and juice one lemon - add to a large bowl.
Peel and finely shred the celeriac with a food processor or julienne cutter. Then, immediately add it to your large bowl. Mix well with a scant half teaspoon of salt.
Whisk the egg yolks with the Dijon mustard and a tsp of olive oil, making a loose paste. Slowly stream in about half the oil, continuously whisking. Halfway through, add 1 tbsp of lemon juice; incorporate well and then continue whisking until you have a thick mayonnaise. You may not need to add all the oil. Stir in the chopped anchovies and capers. Add the remaining lemon or a little vinegar to taste.
Mix in 1 generous tablespoon of Greek yoghurt, remaining capers, and chopped herbs. Add salt and pepper to taste. Pour over the celeriac and toss it in the sauce.
Decorate with finely chopped spring onions and a few of the herbs. Chill for a good couple of hours before serving. It keeps for a couple of days in the fridge.
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Notes
If you are in a hurry, you could also use about five tablespoons of Greek yoghurt whisked with 2-3 tablespoons of extra virgin olive oil (instead of the mayonnaise), then continue to flavour with lemon juice, vinegar, herbs, capers, etc.Alternatively - use a good quality ready-made mayonnaise!