There are 2 yoruba ways of making it...let me discuss one.
You need ground egusi, ground pepper, vegetable(efo), dried-fish or some other eroja(optional), Palm-oil, Seasoning(Maggi), Salt.
Grind the egusi with blender, then heat and stir till the water dries up and the egusi forms clusters. Don't let it burn o!
First you'll heat the palm-oil until smoke fills the whole house.

The you'll fry the pepper paste in it. Add Seasoning and salt.
You must have soaked vegetable in hot-water and cut it before. So add the cut vegetables. You could add dried-fish(and the other erojas) before or after this.
Then add your clustered egusi and stir. Cook everything together and serve with Pounded yam.
