Directions:
1. In a small bowl, whisk together the saba and 1/2 cup olive oil and season with about 1/2 tsp salt and a pinch of black pepper.
2. Put the watercress in a mixing bowl, add some dressing, and toss to coat.
3. Divide the salad among four plates.
4. Preheat a grill pan over a medium-high flame.
5. Rub the salmon fillets on both sides with olive oil and season with salt and pepper.
6. Place skin side down in the pan and cook until the edges of the fish begin to turn opaque, 4 to 5 minutes.
7. Turn the fillets and cook 1 minute more.
8. Transfer them to the serving plates, skin side down, over the watercress.
9. Place the peaches in the grill pan, moving them around gently until they are heated through, about 2 minutes.
10. Arrange the peaches on each serving plate (3 slices per plate) and drizzle them with whatever saba vinaigrette remains in the mixing bowl.
11. Finish with a sprinkling of salt and black pepper. Serve immediately.