Wash and chop the collard greens or kale. Remove any tough stems if necessary.
In a large pot, heat the vegetable oil or palm oil over medium heat. Add the chopped onion and sauté until translucent.
Stir in the minced garlic and chopped tomato. Cook for 5-7 minutes until the tomatoes break down and the mixture becomes aromatic.
Add the ground paprika, black pepper, thyme, and salt. Stir well.
If using, add the tomato paste and cook for an additional 2-3 minutes.
Add the chopped greens to the pot. Stir well to coat the greens with the tomato mixture.
Pour in the beef, chicken, or fish stock if using. Bring to a simmer.
Reduce the heat to low and cover the pot. Cook for 20-30 minutes, or until the greens are tender and have absorbed the flavors. Stir occasionally.
If using, stir in the chopped cooked meat and cook for an additional 5-10 minutes to heat through.
Enjoy your meal!