Rinse seafood and pat dry. Cut fish into bite-size pieces. Set aside.
Heat oil in a medium pot over medium heat.
Add diced onion. Cook until soft, about 4–5 minutes.
Add minced garlic. Stir for 30–60 seconds until fragrant.
Add chopped tomato and diced pepper. Cook until the tomato breaks down, about 5–7 minutes.
Pour in the stock. Stir and bring to a low simmer. Lower heat and simmer 10–15 minutes to blend flavors.
Add fish and shrimp (or clams). Cook gently until seafood is just tender, about 4–6 minutes. Do not overcook.
Taste and add salt, pepper, or paprika as needed. Stir in chopped parsley.
If using rice or pasta, add pre-cooked rice or tiny pasta in the last 2–3 minutes to warm through.
Serve hot with a lemon wedge, and enjoy.