Heat your oil in a large heavy-bottom deep skillet over medium heat. Add in the diced onions together with the bell peppers and saute for about 4 minutes.
Stir in the garlic, all of your seasonings, tomato puree, and crushed tomatoes. Reduce the heat to a medium-low and allow the sauce to simmer for about 6 minutes.
Once your sauce has thickened, pour in the coconut milk. Stir well to combine and bring the sauce to a gentle boil.
Once bubbling, gently add in the fish and shrimp then reduce heat to medium-low. Simmer over medium-low heat for 5 minutes, or until the seafood is cooked through.
Garnish with freshly chopped cilantro, and lime or lemon wedges.
Enjoy!