Potatoes love lovage: this celery-like garden herb is a match made in heaven with new potatoes.
Put the egg yolks, mustard, lemon juice and white wine vinegar into a blender and blend to combine.
Combine the oils in a jug and carefully add to the blender in a thin trickle, blending continuously until the mixture has emulsified into mayonnaise.
Pour the mixture out into a bowl and add the chopped cornichons, black pepper, capers, garlic, anchovy fillets, dill, tarragon, lovage, onion and potatoes.
Mix all together and add salt to taste.
