| 1/3 cup walnut oil or olive oil |
| 3 tablespoons white wine vinegar |
| 1 tablespoon minced fresh tarragon |
| 1 cup very thinly sliced red onion |
| 12 ounces green beans, ends trimmed |
2 Bosc pears (about 12 ounces), peeled, quartered, cored, cut into 2x1/4x1/4-inch strips |
| 1 5-ounce bag mixed baby greens |
| 6 ounces smoked trout fillets |