Koeksisters — plaited doughnuts soaked in ice-cold syrup

i. Origin & history

The name is Afrikaans, built on Dutch roots. Koek means cake or biscuit, and the second half is usually traced to sissen, 'to sizzle' — a fried cake that hisses in the oil. The popular reading as 'cake sister' is a folk etymology, though it has helped the name stick; the doughnuts are often made in pairs or plaits that look companionable.

Frying dough and soaking it in syrup came to the Cape from several directions at once. Dutch settlers brought a tradition of fried doughs such as oliebollen, while enslaved and exiled people from the Indonesian archipelago, India and East Africa — the ancestors of the Cape Malay community — brought spice and syrup-soaked sweets from the Indian Ocean world. The koeksister as it is now known emerged from that mixed Cape kitchen, and it is usually described as a product of both traditions rather than either one.

Over time two distinct sweets grew from that root, and their names are confusingly close. The koeksister of Afrikaner tradition is the plaited, golden, crisp version in clear syrup described on this page. The koesister (pronounced 'koo-sister') of the Cape Malay community is a soft, oval, spiced doughnut flavoured with cinnamon, cardamom, aniseed and ginger, boiled briefly in syrup and rolled in desiccated coconut. Cape Malay families traditionally make koesisters for Sunday morning breakfast.

Koeksisters are deeply woven into Afrikaans social life: sold by the dozen at church bazaars and school fundraisers, carried to braais and family gatherings, and made in quantity by home bakers who often have firm views about plait tightness and syrup spicing. Supermarkets and home-industry shops across South Africa sell them chilled in trays.

ii. Why the syrup has to be ice-cold

Everything about a koeksister depends on the temperature difference between the dough and the syrup. A freshly fried plait is full of hot steam. When it is dropped into very cold syrup, that steam condenses and the pressure inside the dough drops sharply, so the syrup is pulled into the crumb. You can watch it happen: the plait fizzes, then the bubbles slow and stop as it fills.

Cold syrup is also thick syrup. At fridge or freezer temperature the sugar solution is viscous enough that it coats and penetrates rather than simply soaking and sogging the crust. Warm syrup does the opposite — it is thin, it softens the fried shell, and the koeksister ends up limp and greasy instead of glassy. This is why recipes insist on chilling the syrup overnight and why experienced bakers split it into two bowls, keeping one in the freezer while using the other, and swapping them as the working bowl warms.

The dough is built to absorb. It is a soft scone-like dough leavened with baking powder, with only a little butter, so it fries up open-textured and light. The plaiting matters as well: three thin strands give much more surface area than a single fat strip, so the syrup reaches the centre. Rolled too thick, the plait stays bready in the middle however long it soaks.

The syrup is usually sugar and water in a roughly two-to-one ratio, flavoured with lemon juice and zest, ginger and a cinnamon stick. A pinch of cream of tartar, or the acid from the lemon, helps stop the syrup crystallising so the coating stays clear and sticky rather than grainy.

iii. Ingredients

Makes 24 servings · scroll the side panel to adjust

• 1000 g white sugar, for the syrup
• 500 ml water, for the syrup
• 2 tbsp lemon juice, plus the zest of 1 lemon
• 1 cinnamon stick
• 3 thin slices fresh ginger
• ¼ tsp cream of tartar
• 480 g cake flour or plain flour
• 4 tsp baking powder
• ½ tsp salt
• 60 g cold butter
• 1 egg
• 250 ml milk or buttermilk
• 1500 ml sunflower oil, for deep-frying

Cake flour, the standard in South Africa, is a soft, low-protein flour that gives a tender, light crumb; plain flour is the closest equivalent elsewhere. Avoid bread flour, which makes a chewy plait that resists the syrup. Buttermilk gives a slightly more tender dough than milk and is a common family variation. In the syrup, fresh ginger and lemon are what keep it from tasting of plain sugar; some bakers add a vanilla pod or a pinch of ground ginger instead. Use a neutral, high-smoke-point oil such as sunflower, the usual South African choice.

iv. Method

1. The day before, make the syrup: heat the sugar and water, stirring, until the sugar dissolves. Add the lemon juice and zest, cinnamon, ginger and cream of tartar, bring to the boil and simmer 5 minutes without stirring. Cool, divide between two bowls and chill overnight; put one bowl in the freezer for 1 hour before frying.
2. Sift the flour, baking powder and salt into a bowl. Rub in the butter until it resembles fine crumbs. Beat the egg with the milk and stir it in to make a soft, smooth dough. Cover and rest for 30 minutes.
3. Roll the dough out to 5 mm thick. Cut into rectangles about 4 × 10 cm. Make two lengthwise cuts in each, leaving the top 1 cm joined, so you have three strands.
4. Plait the three strands loosely, pinch the ends firmly together and lay the plaits on a floured tray under a cloth.
5. Heat the oil in a deep pan to 180 °C. Fry 3–4 plaits at a time for 1½–2 minutes per side, until deep golden brown and puffed.
6. Lift each plait out with a slotted spoon, let it drip for a second, then drop it straight into the ice-cold syrup. Leave for 30–60 seconds, turning once, until it stops fizzing.
7. Lift onto a wire rack set over a tray to drain. Swap to the second, colder bowl of syrup when the first starts to feel only cool. Chill the finished koeksisters before serving.

v. Tips & common mistakes

• Keep the syrup on ice while you work. Each hot plait warms the syrup. Set the bowl inside a larger bowl of ice, or rotate two bowls between the freezer and the bench.
• Seal the ends of each plait well. Loosely pinched plaits unravel in the oil. Press the ends firmly with a floured finger or a dab of water.
• Watch the oil temperature. Below about 170 °C the plaits absorb oil and turn greasy; above 190 °C they brown before the centre cooks. Fry in small batches so the temperature recovers.
• Roll the dough thin. At more than 5 mm the strands puff into a doughy centre that the syrup never reaches.
• Do not over-soak. Once the fizzing stops, the plait is full; longer just softens the crust.
• Chill before serving. Koeksisters are meant to be eaten cold, when the syrup has set to a glossy, crackly coating.

vi. Variations

The Cape Malay koesister is the main relative: a spiced, yeasted oval doughnut, briefly boiled in syrup and rolled in coconut. Within the koeksister tradition, differences are mostly in the syrup — some families add a vanilla pod, a little honey or a few strips of orange peel — and in shape, from tight mini plaits to long twists. Frozen koeksister dough is sold in South Africa for home frying.

Further afield, the idea of frying dough and soaking it in syrup is shared with East Africa's mandazi, the Arabic luqaimat, the Indian gulab jamun and balushahi, and the Andalusian pestinos. Koeksisters differ from all of them in the shock of the cold syrup.

vii. Serving & storage

Serve koeksisters cold from the fridge, with tea or coffee, at a tea table or bake sale. They are sticky, so provide napkins or small forks. A tray of them is a typical contribution to a family gathering or church event.

They keep 4 days in an airtight container in the fridge and freeze very well: freeze in a single layer, then pack into bags, for up to 3 months. Many South Africans eat them straight from the freezer, when the syrup is almost frozen and the texture is especially crisp. Leftover syrup can be strained and reused once.

ix. More from African

• Mandazi — East African coconut doughnuts
• Luqaimat — Gulf date-syrup dumplings
• Oliebollen — Dutch New Year doughnuts
• Gulab Jamun — Indian syrup-soaked milk balls
• Chak-Chak — Tatar honey-bound fried dough
• Pestinos — Andalusian honey pastries