salmon pieces with salt and pepper. in a mixing bowl; combine butter and lemon juice. place 1 teaspoon of butter mixture in center of foil pieces. divide onion among foil pieces. place fish on top of onion. pour remaining butter mixture over fish. fold and secure ends; place onto baking sheet. bake 15-20 minutes. carefully open foil to allow steam to release. serve immediately, serves 4-6. 