What you need: 

• Groundnut (pounded)
• Salt to taste
• 2 chopped onions (optional)

Method:

• Mix the pounded groundnut together with water to make a thin mixture, ensuring all the lumps have been removed.
• Heat in a saucepan and leave to simmer, stirring now and again to ensure it does not stick to the bottom.
• Onions, garlic and salt should be added towards the end.
• Leave on the low heat until oil comes out on top. Serve with matooke, rice or ugali.