Raw celery and a bright vinaigrette give winter greens a fresh edge, while a garnish of pan-fried shallots makes croutons obsolete.
In a small skillet, heat oil and shallot over medium-high; cook, stirring frequently, until golden brown. With a slotted spoon, transfer shallot to paper towels to drain and season with salt and pepper. Let oil cool slightly.
In a large bowl, whisk together vinegar, mustard, honey, and apple. Slowly add oil from skillet, whisking until combined. Season with salt and pepper, then add escarole and celery stalks and leaves. Toss to combine and top with shallots.