750g/1陆lb small waxy potatoes, such as Charlotte or Pink Fir Apple, well scrubbed
small handful chopped fresh chives
1 small lemon, juice only
handful chopped fresh parsley leaves
陆 small red onion, peeled, finely chopped
3 sprigs fresh tarragon, leaves only, chopped
1陆 heaped tsp Dijon mustard
5 salted anchovy fillets in oil, drained, chopped (optional)
2 tbsp baby capers, drained and rinsed
salt and freshly ground black pepper
50ml/2fl oz olive oil
250ml/9fl oz sunflower oil
3 medium free-range egg yolks
18 quails' eggs