Trout spring green and potato salad

1. Oil and season the trout. Steam the potatoes until tender. Steam the asparagus and beans until tender-crisp.
2. While they’re still warm, mix the vegetables with 2⁄3 of the dressing. Turn onto a suitable platter.
3. Cook the trout, skin-side down, in a non-stick pan over a low heat until the skin is crisp and the flesh just cooked and moist. While still warm, place on top of the vegetables, tuck in the lettuce leaves, drizzle over the remaining dressing and season to taste.