Choose a quality oil and vinegar
When a dish has so few ingredients, everything counts! Buy a really good oil and a really good vinegar. I chose an oil from Raymonde Treille, a walnut grower in Sainte-Mondane (in the Périgord, right near Sarlat). Her walnut oil is top quality. If you’re a camper-van traveller and a France Passion member, you can stop over at her place. She’s wonderful, as is her walnut cake, which I recommend! If you’re not a camper-van traveller, you can still go, as she has a shop where she sells oil, walnut paste, walnut halves and often walnut cake… in that case it’s best to call ahead to be sure of finding her!
For the vinegar, I use a very mild white balsamic… I buy mine in Modena, but it’s sold in some organic supermarkets.
