Wash lemon, grate dry and finely grate peel. Halve lemon and squeeze juice. Wash thyme, shake dry and pluck leaves from the stalks. Sort the currants, wash and drain well. Strip berries from the panicles.
About half of the berries, juice, oil, vinegar, lemon juice and zest finely puree. Season to taste with salt and pepper, stir in the remaining berries and thyme. Quantity results in approx. 300 ml or 6 portions.