Boil the Omena. This reduces the bitterness. You can add some lemon this will remove smell

Boil for like 30 minutes. Then cut the onions.

Fry onions until brown. Add the boiled Omena stir. Add tomato paste. Stir and cook for a few more minutes. Dissolve royco in 30 MLS of water or 1/4 cup of water and add to the cooking Omena

Boil for 10 more minutes with a little more water. Serve.

Serve with ugali