These greens get a sweet, tart boost from apples and cider vinegar.
In a small saucepan, heat extra-virgin olive oil over medium-high. Add shallot and season with coarse salt and ground pepper; cook until soft, about 4 minutes. Add apples and cook until beginning to soften, about 5 minutes. Remove from heat and stir in cider vinegar. In a large bowl, toss escarole, roughly chopped, with apple mixture; season with salt and pepper.
Serve as a side with roasted pork or sauteed turkey cutlets.