{"id":2763,"slug":"rainbow-cake","title":"Rainbow Cake","description":null,"ingredients_raw":["675 g (1.49 lb / 5½ sticks) unsalted butter, plus extra for greasing","675 g (1.49 lb / 3 cups) superfine sugar","1 tbsp vanilla extract","12 medium or 10 large (about 500 g) eggs","675 g (1.49 lb / 5 cups) self-raising flour","1 tbsp baking powder","½ tsp each of red, orange, yellow, green, blue, purple food colourings","500 g (1.1 lb / 4 sticks) unsalted butter","1 kg (2.2 lb / 8 cups) powdered sugar","3 tbsp milk","Sprinkles (eg. hundreds and thousands) (optional)"],"ingredients_norm":["unsalted butter","superfine sugar","vanilla extract","egg","self raising flour","baking powder","each of red orange yellow green blue purple food colouring","powdered sugar","milk","sprinkle"],"steps":["Preheat the oven to 190 C. Grease and line six 20 cm round cake tins.","Beat the butter, sugar and vanilla in a large mixing bowl, until soft and fluffy.","Beat in the eggs, two at a time.","Combine the flour and baking powder. Fold this dry mixture into the batter.","Divide the mixture into 6 separate bowls.","Add the red food colouring, one drop at a time, to the mixture in one bowl and stir in until the mixture reached the desired colour.","Repeat step 6, using orange, yellow, green, blue and purple food colourings.","Spread the red mixture in one of cake tin. Repeat with other colours.","Bake for 25 minutes, in batches of two cakes, until a skewer inserted comes out clean.","Transfer the cakes to a wire rack and leave to cool. Unmold cakes.","For the icing, beat the butter in a mixing bowl until soft.","Add half of the icing sugar, 1 cup at a time, and beat in.","Beat in the milk and vanilla extract.","Add the rest of icing sugar, 1 cup at a time, and beat in.","Spread one-eighth of the icing onto the purple cake. Top with blue cake layer, and press gently.","Repeat the frosting and cake layering in rainbow order, finishing with the red layer.","Spread the rest of icing all over the cake.","If you like, sprinkle the cake with sprinkles.","Enjoy!"],"categories":["Recipes for dessert","Recipes for cake","Recipes using butter","Recipes using egg","Recipes using baking powder","Recipes using superfine sugar","Recipes using powdered sugar","Recipes using self-raising flour","Recipes using food coloring","Recipes using cow milk"],"prep_time_minutes":null,"cook_time_minutes":null,"total_time_minutes":120,"servings":"48","yield_text":null,"difficulty":"hard","source_name":"wikibooks","source_url":"https://en.wikibooks.org/wiki/Cookbook:Rainbow_Cake","source_ref":"4587451","authors_url":"https://en.wikibooks.org/w/index.php?title=Cookbook:Rainbow_Cake&action=history","license":"CC BY-SA 4.0","license_url":"https://creativecommons.org/licenses/by-sa/4.0/","extraction_confidence":null,"content_hash":"ef30c815eab58649b8d16db8634afb2ba7e052ebe256ae869bd765579c33fc58","created_at":"2026-08-02T14:43:17Z","updated_at":"2026-08-02T17:11:31Z","notice":null,"url":"https://recipecontextprotocol.com/recipes/rainbow-cake"}