In a bowl, whisk together the hoisin sauce, honey, soy sauce, mirin, garlic, salt, white pepper, and five spice powder.
Reserve 1/4 cup of the marinade for glazing during the cook.
Slice the pork tenderloin into long strips about 1 1/2 inches thick.
Place the pork in a large resealable bag or container and pour in the remaining marinade.
Refrigerate overnight or at least 8 hours.
Remove the pork from the refrigerator 30 minutes before cooking.
Set up your Big Green Egg for direct grilling and preheat to 450°F.
Grill the pork for about 8 to 10 minutes per side, turning as needed for even color.
Brush with the reserved marinade during the cook.
Cook until the pork reaches an internal temperature of 140°F.
Remove the pork from the grill and let rest for 10 minutes.
Slice the pork thinly for serving.
Cook the vermicelli noodles according to package directions.
Drain the noodles, rinse with cold water, and set aside.
Prep the cucumber, carrots, scallions, and salad greens.
In a small bowl, whisk together all dressing ingredients until fully combined.
Divide the noodles among serving bowls.
Arrange the salad greens, cucumber, carrots, sliced pork, and scallions over the noodles.
Drizzle with the Thai dressing.
Top with crushed peanuts and serve immediately.