In a large pot, heat the olive oil over medium heat. Add the chopped onion and bell pepper, cooking until they are soft and translucent, about 5 minutes. Stir in the minced garlic, cooking for an additional minute until fragrant.
Add the rice to the pot, stirring to coat it with the oil and vegetables. Sprinkle in the red pepper flakes and salt, mixing everything well.
Pour in the crushed tomatoes and water. Stir to combine all the ingredients. Bring the mixture to a gentle boil.
Once boiling, reduce the heat to low and cover the pot. Let the soup simmer for about 15 minutes, or until the rice is cooked through and tender.
Stir in the coconut milk, and then add the shrimp. Cook for an additional 5-7 minutes, or until the shrimp are pink and opaque.
Stir in the ground black pepper and lemon juice. Taste the soup and adjust the seasoning if needed. Serve hot, garnished with a sprinkle of fresh parsley.