1/2 cup cilantro, finely chopped, plus whole leaves for serving
Flaky sea salt and freshly ground black pepper
YIELD 4 servings
Place racks in top and center of oven; preheat to 425°F. Finely grate 2 tsp. lime zest into a small bowl. Stir in cumin, chile powder, brown sugar, and 2 tsp. salt.
Toss brussels sprouts, onion, squash, 2 Tbsp. oil, and half of spiced salt on a rimmed baking sheet. Transfer to center rack in oven and roast 10 minutes. Toss and continue to roast until vegetables are browned and cooked through, 10–15 minutes more.
Meanwhile, rub pork tenderloins with remaining spiced salt and heat remaining 2 Tbsp. oil in a large skillet over medium-high. Sear pork on 3 sides until lightly browned, about 3 minutes per side. Turn tenderloins onto remaining side, then transfer skillet to top rack of oven. Roast pork until an instant-read thermometer inserted into thickest part registers 140°F for medium-rare or 145°F for medium, 8–10 minutes (temperature will rise by about 10°F after cooking). Transfer pork to a cutting board and let rest 5 minutes before slicing.
Whisk sour cream, 2 tsp. lime juice, 1/2 cup cilantro, and remaining 1/4 tsp. salt in a small bowl. Spoon some sauce onto plates, then arrange pork over. Top with cilantro leaves, flakey sea salt, and pepper. Serve vegetables and lime wedges alongside.