Vietnamese Grapefruit & Pork Salad (Pork Goi Buoi)

Preheat oven to 425 degrees F.

To prepare pork: Combine garlic powder, onion powder and pepper in a small bowl. Season pork on all sides with the spice mixture. Heat oil in a large skillet over medium-high heat. Add pork and cook until browned on all sides, 3 to 4 minutes total. Transfer the pan to the oven. Roast until an instant-read thermometer inserted in the thickest part registers 140 degrees F, 10 to 14 minutes. Let the pork rest on a clean cutting board for 30 minutes. Cut into 1/4-inch-thick slices.

To prepare dressing: Meanwhile, working over a medium nonreactive bowl, suprême grapefruit (see Tips). Squeeze the membranes to extract the juice. Using a slotted spoon, transfer the segments to another bowl, leaving the juice behind. Add garlic, chile, minced shallot, lime juice, fish sauce and sugar to the juice.

To prepare salad: Combine sliced shallot, carrot, celery, cucumber, bell pepper, basil, cilantro and mint in a large bowl; toss with two-thirds of the dressing. Add the grapefruit; gently toss to combine.

Divide watercress among 4 plates and top with the salad and the pork. Garnish with peanuts. Drizzle with the remaining dressing.