medium dried skipjack tuna (pindang tongkol) • water • tomatoes, sliced • Indonesian bay leaves (daun salam) • thumb-sized piece ginger, lightly crushed • thumb-sized piece galangal, lightly crushed • sweet soy sauce (kecap manis), or to taste • Sugar, to taste • Salt, to taste • Ground black pepper, to taste • Seasoning powder (optional) • Cooking oil, for sautéing •