Place the onion slices and salt into a small bowl and rub them well to remove the raw red onion's bitterness. Then wash the onion slices and drain them well. Then add the sumac and mix it with red onion slices well and then set aside for garnishing.

Wash and drain the liver well. Then cut the liver into 2cm (0.8 inches) cubes and put it in a bowl.

In a separate bowl; mix the all-purpose flour, baking powder, and salt.

Place the liver cubes into the all-purpose flour mix and make sure all mix well. Then, take out the liver cubes from the bowl and place them in a strainer to remove the excess flour mix.

Place the sunflower oil in a deep frying pan and bring the heat to a medium level. To make sure the sunflower oil is hot enough for frying, just toss a pinch of flour into the frying pan to see if it is sizzling or not. If it is sizzling then it means it is ready for frying.

Place the liver cubes in the frying pan and add the red pepper powder and then saute for about 2-3 minutes. Liver cubes cook very fast so do not cook them for more than 3 minutes.

Put a paper towel on a plate and then take out the liver cubes from the frying pan with a strainer scoop to remove the excess oil.

Place the liver cubes on a serving plate.

Garnish with the red onion and sumac mixture.

Serve.