Make the dressing first. Crush the sea salt, rosemary, garlic, and sugar into a paste with a mortar and pestle (or smash it all together with a knife). Work in the creme fraiche and vinegar, taste and adjust with a bit of pepper and more salt if needed.

When you're ready to serve, combine the celery, apples, salad greens, and most of the nuts with a few half of the dressing. Toss well, adding more dressing until it is to your liking. Finish with the remaining nuts, and any torn celery leaves.

* If you're not going to use the apples immediately keep them in a bowl of water spiked with a bit of lemon juice (or the white wine vinegar you're using for the dressing). Drain and pat dry before using.