Blend the precooked rhubarb (with a little juice if there is any left) until you get a very smooth mixture.
Pour the rhubarb into a bowl, add the honey and 5cl of olive oil in a thin stream, while whisking quite vigorously. Then, do the same with the hazelnut oil, until you obtain a smooth consistency similar to mayonnaise.
Season with spices.
Optionally, add chopped spring onions.
Leave to cool in the fridge for 20-30 min.
Serve with raw vegetables (carrots, cauliflower and radishes)