Old-Fashioned Wacky Cake
Wacky cake goes by many names — crazy cake, three-hole cake, Depression cake — and it earns every one of them. Born in the lean years of the 1930s and baked right through wartime rationing, it's a proper chocolate cake made with no eggs, no butter and no milk, because there simply weren't any to be had. What there was: flour, sugar, cocoa, a little oil — and the discovery that vinegar fizzing against bicarbonate of soda will raise a cake all on its own.
Two things make or break it. First, whisk the dry ingredients thoroughly, right in the tin — a good thirty seconds with a fork, until it's one even colour with no pale streaks. A stray pocket of bicarbonate tastes soapy, and even mixing is all this cake asks of you instead of creaming and beating. Second, the moment the cold water hits the vinegar the fizz begins, and that fizz is the only lift the cake has — so stir until just smooth and get it straight into the hot oven. No dawdling, and no overmixing either.
The famous three wells and the mixing-in-the-tin were never a party trick — one less bowl to wash was the entire point, in kitchens where the washing-up water was heated on the stove. It bakes into a cake far better than it has any right to be: dark, moist and honestly chocolatey. And with no egg, butter or milk anywhere in it, wacky cake is accidentally, perfectly vegan — about eighty years before anyone thought to call it that.
Old-Fashioned Wacky Cake
Rich chocolate cake with no eggs, no butter, no milk — mixed with a fork right in the tin.
Ingredients
- 190 g plain flour
- 200 g caster sugar
- 25 g cocoa powder (about 4 tbsp), sifted if lumpy
- 1 tsp bicarbonate of soda and ½ tsp fine salt
- 1 tbsp white vinegar (or cider vinegar)
- 1 tsp vanilla extract
- 75 ml vegetable or sunflower oil
- 240 ml cold water
- icing sugar, to dust (optional)
Method
- Heat the oven. 180°C (fan 160°C / gas 4). Get out a 20 cm square tin — no greasing, no lining. You'll mix in it, bake in it and serve from it.
- Whisk the dry. Flour, sugar, cocoa, bicarbonate of soda and salt straight into the tin. Whisk with a fork for a good 30 seconds, until one even colour with no pale streaks, then level it off.
- Poke three wells. Two small, one large. Vinegar into the first, vanilla into the second, oil into the big one.
- Add the water. Pour the cold water over the whole lot — it will start to fizz, and that fizz is the lift. Stir with the fork until just smooth, chasing the dry flour out of the corners. A few small lumps are fine; the batter is thin.
- Bake. Straight into the oven — no dawdling — for 30–35 minutes, until risen and a skewer in the centre comes out clean.
- Cool and cut. Cool in the tin, dust with icing sugar and cut into 9 squares — served straight from the tin, as it always was.
Granny never greased the tin and never turned the cake out — squares were cut and handed over the side, one by one. If you want yours out whole for frosting, mix the batter in a bowl instead and pour it into a greased, lined tin; the cake won't mind a bit.
Tips for the lightest wacky cake
Whisk the dry properly
A stray pocket of bicarbonate tastes soapy. Thirty seconds with a fork until the cocoa is one even colour is the cheapest insurance in baking.
No dawdling
The fizz starts the moment water meets vinegar — and that fizz is the only lift this cake has. Mix, then straight into the hot oven.
Stop at smooth-ish
Stir just until no dry flour hides in the corners. Beating a thin batter knocks the bubbles out and toughens the crumb.
Questions, answered
Why does wacky cake have no eggs, butter or milk?
It was invented when there weren't any — during the Depression and the wartime rationing of the 1930s and 40s, when eggs, butter and milk were scarce or too dear. Oil supplies the richness, and bicarbonate of soda reacting with vinegar supplies all the lift eggs normally would. That also makes it naturally vegan and dairy-free, with no substitutions needed.
Why is there vinegar in wacky cake — can you taste it?
No. The vinegar is there purely to react with the bicarbonate of soda, producing the carbon dioxide bubbles that raise the cake. The reaction uses the vinegar up as it bakes, so there is no sour taste at all in the finished cake. White vinegar, cider vinegar or even lemon juice all work.
Should wacky cake be frosted or just dusted with icing sugar?
Traditionally just a dusting of icing sugar once cool — sugar was rationed too, so frosting was for high days. It also takes a simple chocolate water icing (icing sugar, cocoa and a splash of hot water) or a swirl of buttercream beautifully. Frost only when the cake is completely cool, and frost it right in the tin.
Can I double wacky cake for a 23 × 33 cm (9 × 13 in) tin?
Yes — double every ingredient, mix directly in the larger tin (poke six wells, or three bigger ones) and bake at the same temperature for 35–40 minutes, until a skewer in the centre comes out clean. It cuts into about 18 squares.