Marinate fish with 3 tablespoons fish sauce and crushed black pepper. Set aside for at least 1/2 hour
Prep veggies while fish marinates
Combine broth ingredients, bring to a boil, then lower to medium heat.
Cook fish in broth 3-5 minutes but do NOT add marinated fish sauce. Remove fish from broth and set aside.
Increase heat to boil. Add pineapple, tomatoes, okra and cook for 3 minutes. Add elephant ear and bean sprouts; cook for another 2 minutes. Adjust broth seasoning as needed.
Add fish back. Garnish with green onion, rice paddy herb, fried garlic or shallots and serve.