Combine lemongrass, garlic, 2 tablespoons sugar, fish sauce and vegetable oil in a bowl. Add pork and mix well to coat the pork. Refrigerate and marinate for at least 30 minutes and up to 2 hours.
In a shallow bowl, dissolve remaining sugar in the rice vinegar. Add daikon radish and carrots, mix well to combine. Refrigerate for 1 hour. Drain liquid from vegetables before serving.
Prepare rice according to package instructions.
In a small bowl, mix together the hoisin and Sriracha sauces.
While rice is cooking, preheat grill. Thread pork onto 4 skewers and grill until lightly charred and cooked through, about 5 minutes.
To serve, place a scoop of rice in each of 4 bowls, add daikon radish and carrots and pork skewers. Drizzle with sauce and garnish with cilantro.