Planch and peel the apricots, then halve and remove the stones.
Arrange the apricots in a glass serving dish.
Crack the stones and remove the kernels.
Chop the kernels.
Mix together the soured cream, vinegar, sugar and salt and pepper to taste.
Spoon this dressing over the apricots and sprinkle with the tarragon and chopped apricot kernels.