Bring the pineapple juice, soy sauce, vinegar, lemon juice, olive oil, and honey to a simmer in a saucepan over medium-high heat. Reduce the heat to medium-low, and stir in the sugar, 1 teaspoon black pepper, and garlic powder. Simmer, stirring occasionally, until the sauce has reduced to a syrupy consistency, about 15 minutes. Set the sauce aside.
Season the salmon with a light sprinkling of salt and pepper. Place the fillets on a foil lined cookie sheet. Spoon a small amount of the sauce over the salmon fillets and place the pineapple chunks all around the fish. cook until the fish turns opaque in the center, (about 5 to 8 minutes) Serve with the remaining sauce and cooked pineapple.