Eggplant and Seafood Stew from Ghana

Name: Eggplant and Seafood Stew from Ghana
Ingredients: 2 pounds eggplant, peeled and diced; 2 medium size onions, chopped; 9 ounces small okra, bottoms trimmed; 1 green bell pepper, seeded and chopped; 1 medium size, ripe tomato, peeled, seeded, and chopped; 1 cup water; 2¼ teaspoons salt; 1 teaspoon freshly ground black pepper, or to taste; 1 teaspoon cayenne pepper; ¼ cup peanut oil; 2 pounds flat white fish fillets, such as sole, red snapper, or John Dory; 1 pound fresh shrimp with their heads on or ½ pound previously frozen headless shrimp, shelled