Salmon Tacos With Pineapple Salsa

Name: Salmon Tacos With Pineapple Salsa
Ingredients: 1 (2) piece ginger, peeled, finely grated; 2 garlic cloves, finely grated; 2 tsp. New Mexico or Kashmiri chile powder; 1 tsp. ground coriander; 1 tsp. ground cumin; 4 Tbsp. fresh lime juice, divided; 3 Tbsp. grapeseed or vegetable oil, divided; 1 ½ tsp. Diamond Crystal or 1 tsp. Morton kosher salt, plus more; 1 (1½-lb.) skinless, boneless salmon fillet, cut into 2 pieces; ½ small red onion, finely chopped; 2 serrano chiles, finely chopped; 2 cups chopped pineapple (from about ½ medium pineapple); ½ cup chopped fresh cilantro, plus leaves for serving; Lime wedges and toasted corn tortillas (for serving)