The secret to sudza is making sure it is cooked long enough to break down the grain so it is smoother as opposed to grainy on the palate. You can let it steam on a low very low heat with the lid on the pot to get the desired results.
Always add salt to the boiling water. The quantity of water you use will determine the consistency of the sudza. Generally sloppy sudza (pap) for breakfast and stiff sudza for lunch / dinner. Although stiff sudza is also good for breakfast.
A slight short cut if you want get stuck in a little quicker is to place the uncooked sudza in a bowl and mix with hot water. It will be a very grainy mixture. Leave it to rest for as long as possible (maybe you'll have a shower or walk the dog etc). Boil some water in a pot, less than you would if you were doing the long steaming method. Once the water is boiling, slowly add the mixture while stirring. It should stiffen to the right consistency depending on the water ratio. This is a learning process. If it is too sloppy you can add dry sudza to stiffen up. ( Bear in mind that added grain will be course).
NOTE: there is no possible way to get smooth sudza without time steaming. (Much like I hear is the the case for grits...?)
Keep stirring, hard and strong, it's good for an upper arm work out!
Reduce the heat and let it steam through. The longer you let it steam the less grainy it will be.
Breakfast is usually sudza with milk, sugar / syrup and a dollop of butter.
Lunch / dinner... there's whole world to choose from.
ps... krimmel pap (crumb sudza) is only good for leaving in the pot until it is dry and then scattering on the lawn for the birds.