Mesclun in Pistachio Oil Dressing

A mesclun is, in the language of the French Provence, a mixture of immature salad greens of all breeds. The equivalent to mesclun exists in all other provinces of France (and, I am pretty sure, all over the temperate countries of Europe), made with different greens and called saladine, meaning young salad. Both mesclun and saladine are prepared when, after having sowed the salad seeds, a multitude of small, tender leaves of many types come up all at once in late spring through to midsummer.