This vegan braised kale and chickpea sandwich with sumac onions is a delicious and nutritious option for a quick and easy lunch. The kale and chickpeas are cooked in a flavorful broth until tender and then piled onto a toasted bun. The sumac onions add a tangy and slightly sweet flavor that complements the earthy kale and creamy chickpeas. This sandwich is packed with protein, fiber, and vitamins, making it a satisfying and healthy choice.