If using fresh taro leaves, wash them thoroughly and remove any tough stems. If using frozen taro leaves, thaw them according to package instructions.
In a large skillet or saucepan, heat the vegetable oil over medium heat.
Add the chopped onion and minced garlic. Sauté until the onion is translucent and fragrant.
Add the diced or shredded corned beef to the skillet. Cook for a few minutes, stirring occasionally.
Stir in the soy sauce, fish sauce (if using), black pepper, salt, and thyme. Mix well.
Pour in the coconut milk and stir to combine. Bring the mixture to a gentle simmer.
Add the taro leaves (or spinach) to the skillet. Stir to combine, ensuring the leaves are well-coated with the coconut milk mixture.
Cover the skillet and let it simmer on low heat for about 20-30 minutes, or until the taro leaves are tender and the flavors are well blended.
Enjoy your meal!