Seared Salmon Paka

Name: Seared Salmon Paka
Ingredients: 1 Tbsp. vegetable oil; 4 6-oz. boneless salmon fillets, preferably skin-on; 2 tsp. Diamond Crystal or 1¼ tsp. Morton kosher salt, plus more; 1 medium onion, coarsely chopped; 2–3 green Thai chiles, depending on heat preference, plus more halved lengthwise for serving; 3 garlic cloves; 1 1½ piece ginger, peeled; 1 Tbsp. double-concentrated tomato paste; ½ tsp. ground turmeric; ¼ cup cilantro leaves with tender stems, plus more for serving; 2 13.5-oz. cans unsweetened coconut milk, divided; 1 Tbsp. fresh lime juice; Cooked basmati rice or country-style bread and lime wedges (for serving)