Ogbono develops its signature smooth, drawing texture when it is introduced gently over low heat. Mix the ground seeds thoroughly with the palm oil before adding them to the stock, then allow the soup to simmer uncovered.
The soup will continue to thicken as it rests. Keep a little reserved stock nearby and add it gradually until the consistency is rich, silky and easy to serve. Add the leafy greens near the end to preserve their color and character.