For the Pork Dumplings: Cook the dumplings according to the instructions on package.
For the Dipping Sauce: In a small bowl, combine the soy sauce, rice vinegar, sesame oil, sugar (if using), and red pepper flakes (if you want some spice). Stir until the sugar (if using) has dissolved.
For the salad: In a medium saucepan over high heat, bring water to a boil. Add quinoa and reduce heat to medium. Cover and simmer until water is absorbed and quinoa is softened, about 15 minutes. Remove from heat. Fluff with a fork, then add cranberries on top. Cover and let steam for 5 minutes.
Place kale in a large bowl; season with salt. Massage kale with your hands to combine, about 1 minute. Add quinoa, cranberries, apples, onion, pecans, and feta to kale and toss to combine.
In a small bowl, whisk mustard, oil, honey, lemon juice, and red pepper flakes; season with salt and black pepper.
Pour dressing over salad and toss to combine.
Serve salad with pork dumplings, sauce, and iced tea.