1. Combine first 4 ingredients in a small bowl; mix well.
2. Heat oil in a large nonstick skillet over medium-high heat. Add salmon, skin side down; cook 4 minutes on each side or until fish flakes easily with a fork or until desired degree of doneness. Arrange 1 fillet on each of 4 plates. Top fillets evenly with jalapeño slices. Spoon about 2 tablespoons soy sauce mixture over each serving; let stand 10 minutes before serving.