Ingredients
For
10
servings
300 g Grenaille potatoes
200 g Campina butter, unsalted
20 g garlic
10 g thyme
200 g vegetable stock
salt
200 g onion in balsamic vinegar
20 g sugar
1 kg spring onions
1 l water
white wine vinegar to taste
salt
2 onions
black colouring, powder
20 g flat-leaf parsley
20 g chives
20 g lovage
20 g dill
2.5 eggs
100 g sunflower oil
salt
Preparation
Peel the potatoes and cut into thick slices.
Add the remaining ingredients, vacuum-pack everything and cook sous-vide for 30 minutes at 82°C.
Reduce the cream to half its volume.
Add the boiled potatoes and cold knobs of butter and mix well.
Pass through a fine sieve and transfer to a siphon.
Aerate with a gas cartridge.
Put all the ingredients in a pan and cook until soft.
Blend well until smooth and strain through a fine sieve.
Put the spring onions and water in a saucepan and simmer for two hours on a low heat.
Pass through a fine sieve and season to taste with salt and white wine vinegar.
Peel the onions, cut into thin slices and dry the slices in a food dryer.
Blend the dried onion to a powder and mix with the black powder.
Blanch the herbs in boiling water, cool in iced water and dry on kitchen towel.
Put the herbs in a blender, blend with the oil and leave in a cheesecloth to drain.
Boil the eggs for four minutes and allow to cool.
Put the eggs in the mixer and start beating, slowly adding the herb oil to make the mayonnaise.
Finally, season with salt to taste.
Assembly
Warm the potatoes in butter emulsion (vegetable stock, butter) and arrange the slices on the plates.
Finish the dish with the mayonnaise, onion, jam, foam, caviar and onion powder.
Pour on the bouillon at the table.