If using taro leaves, remove the tough stems and veins. Rinse the leaves thoroughly and chop them into smaller pieces.
If using spinach, rinse and chop the leaves.
In a large pot, heat the vegetable oil over medium heat.
Add the finely chopped onion and sauté until translucent, about 5 minutes.
Add the minced garlic and cook for another minute until fragrant.
Stir in the diced tomato and cook for 2-3 minutes until softened.
Add the chopped taro leaves (or spinach) to the pot. Stir well to combine with the sautéed aromatics.
Cook for about 5-7 minutes, stirring occasionally, until the leaves are wilted and tender.
Pour in the coconut milk and stir to combine.
Season with salt and black pepper.
Bring the mixture to a gentle simmer and cook for another 10 minutes, allowing the flavors to meld together.
Transfer the rourou to a serving dish.
Enjoy your meal!