In this satisfying, do-ahead sandwich, the kale salad gets more flavorful and tender as it sits. It's perfect for a picnic!
The pressing step is paramount for this sandwich; it allows flavors to meld beautifully and compresses the ingredients, preventing sogginess and making for a cohesive bite. Ensure your pressing weight (like a cast-iron skillet or culinary bricks) is substantial for best results. Pre-salting the chicken before grilling enhances its flavor and juiciness. For the kale, thinly slicing and tossing with dressing ahead of time tenderizes it significantly, making it less fibrous and more palatable. Don't skip scooping out the sourdough crumb; this creates space for ample filling without making the sandwich unwieldy.