In a medium pot, over medium heat, warm the olive oil and butter.
Add the onions, red pepper, garlic, tomato and sautué until tender and translucent, about 10 minutes, stirring occasionally. Add cumin, color, salt and pepper.
Add the potatoes, plantains, yuca, coconut milk and water and bring to a boil. Reduce heat and simmer for about 30 minutes.
Add the fish and cook for 15 minutes more. Serve warm.