In a pot, heat coconut oil. Add cinnamon stick, nigella seeds, turmeric powder and cumin seeds. Along with chopped garlic.
Now add tomatoes and collard greens along with all spice powder, lemon juice salt, and brown sugar. Sauté this well. Add water and cover it and let it simmer for 30 to 35 minutes or till the greens become soft.
Once done, serve this with rice or any other accompaniment of your preference.