Add the flour, salt, sugar and yeast to a large mixing bowl and mix.
Once mixed, add the lukewarm water and mix until just combined. Tip onto a clean working surface and knead for about 10mins. Use additional flour to bring the wet dough together - I used about 1/4 of additional flour but this might not be the case for you. Just be mindful of the fact that you don't want the dough to be dry so don't add too much flour.
Place the kneaded dough in an oiled bowl and cover with clingwrap. Place in a warm area for about an hour or until it has doubled in sized. This would be the perfect time to make the curried mince if you are making one.
Section the risen dough into 4 large sections and then each of those sections into 4 or 5 sections depending on whether you're making large or medium vetkoeke. Roll them into balls and place them on an oiled or floured tray and cover with a clean cloth. Allow to rest for about 20mins. Meanwhile, bring the oil to a medium heat. When the oil has reached 200 degrees celsius you're good to go. A steady medium heat usually does the trick - you don't want the oil to be just below it's smoking point.
Pick up the dough with your hand and gentle drop it into the hot oil - be mindful of working around the hot oil. Don't worry if the dough doesn't keep its shape when picking it up. You want the dough to gentle bubble to ensure that you're vetkoek cooks through. If it changes color too quickly, you'll end up with a raw interior. Cook the vetkoek in batches, each batch taking around 5 minutes. Place the cooked vetkoek on a tray lined with kitchen towels and serve immediately.