Spread 1 teaspoon of ketchup on each slice of bread. Sprinkle with oregano, then add cheese, sujuk (or substitute with ham or your preferred meat), 2 slices of tomato, 1 slice of onion, and 1 sliced black olive.

Crack the eggs into a bowl, add a little salt and pepper, and mix until combined. Dip both sides of the bread into the egg mixture.

Fry each side until cooked, being careful not to flip back and forth to avoid spilling the filling.