Sift the flour and mix in the maize meal, yeast, sugar and salt.
Mix the egg with the water and add enough lukewarm liquid to the dry ingredients to form a soft but pliable dough.
Knead for 10 minutes.Cover the dough with plastic and leave to rise until double in size.
Knock down the dough and place in a greased enamel bowl.
Allow to rise once again until double in size before steaming.
Meanwhile prepare a pot for steaming: bring water to the boil in a pot large enough to hold the bowl containing the dombolo.
Immerse the bowl in the hot water (the water should come one third of the way up the sides of the bowl).
Seal the pot tightly and simmer gently for 1 hour.
Avoid opening the lid while steaming.
Replenish the water if necessary.
To serve, cut the dombolo into wedges.