½ cup soy sauce
3 limes
2 tablespoons grated ginger
2 teaspoons toasted (Asian) sesame oil
4 garlic cloves, finely chopped
4duck breast halves 2½ pounds, rinsed and patted dry
2 tablespoons rice wine vinegar
2teaspoons Thai or Vietnamese fish sauce
3 small jalapeños, seeded
¼ cup extra-virgin olive or peanut oil
Kosher salt
black pepper
1large cucumber, peeled and thinly sliced
2large carrots, peeled and coarsely grated
⅓ pound radishes, thinly sliced
¼cup chopped cilantro, plus more for garnish
¼cup chopped mint, plus more for garnish
⅓ cup chopped salted roasted peanuts
Whisk together ¼ cup soy sauce, juice and zest of 1 lime, ginger, and sesame oil. Mash half the garlic into a paste and whisk it into this marinade. Trim away the duck skin and most of the fat (reserve for rendering, if you like). Place the duck in a shallow dish and pour the marinade over it, turning to coat. Cover with plastic wrap and refrigerate for 1 to 12 hours. Remove from the refrigerator 30 minutes before cooking.
In a small bowl, whisk together ¼ cup soy sauce, vinegar, juice of 2 limes, fish sauce, 2 jalapeños (finely chopped) and oil. Mash the remaining garlic to a paste and whisk into this vinaigrette.
Light a grill for high indirect heat (or heat a broiler with a rack 8 inches from the heat). Remove the duck from the marinade, scraping off any excess bits, and season with salt and pepper. Transfer duck to the unlighted portion of the grill; close cover and cook to desired doneness, 5 to 6 minutes per side for medium-rare. (If broiling, place duck on a baking sheet. Broil, turning once halfway through, 4 to 5 minutes per side for medium-rare.) Transfer to a cutting board and let it rest for 5 minutes. Thinly slice against the grain.
In a large bowl, toss together cucumber, carrots, radishes, cilantro, mint and 1 jalapeño (thinly sliced), with just enough of the vinaigrette to lightly coat everything. Taste and season with salt and pepper as needed. Toss in the peanuts. Place salad on a large platter and top with sliced meat. Drizzle with more of the vinaigrette, and sprinkle with cilantro and mint.