How to Make It
In a small bowl, mix the sherry vinegar with the shallot and thyme and let stand for 10 minutes. Whisk in the mustard, honey and olive oil and season the dressing with salt and pepper.
In a medium saucepan of boiling salted water, cook the green beans until they are crisp-tender, about 3 minutes. Drain and rinse the green beans under cold running water until they are cool; pat dry. Cut the green beans into 1/2-inch lengths.
In a large bowl, toss the green beans with the romaine hearts, watercress, frisée, arugula, apple, pear, avocado and Idiazábal cheese. Toss the salad with the dressing and season with salt and pepper. Serve the salad at once.