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This is a white chocolate mud cake sponge: butter, oil and white chocolate melted together with brown sugar and milk, then finished with flour and egg. The method is the classic melt-and-mix mud cake approach, which is why the crumb comes out so dense, damp and fine rather than light and airy.

The flavour is gentle — creamy white chocolate and a soft caramel note from the brown sugar, lifted by a small amount of rum. Because it is firm and moist, it carves and stacks beautifully, holds ganache and fondant without slumping, and keeps well for several days, which makes it a reliable base for decorated and sculpted cakes.

Ingredients

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Weight Per Unit: 1354
Number of Units: 1
Unit Size: 20 cm round tin, about 7 cm high
WEIGHT
(grams)
ALTERNATIVE METRIC INGREDIENT IMAGE CONDITION
A 150 5.3 ounces Butter Butter is a solid dairy product made by churning fresh or fermented cream or milk, to separate the butterfat from the buttermilk. It is generally used as a spread on plain or toasted bread products and a condiment on cooked vegetables, as well as in cooking, such as baking, sauce making, and pan frying. Butter consists of butterfat, milk proteins and water.
unsalted
diced
B 90 3 fluid_ounces Cooking Oil Cooking oil is plant, animal, or synthetic fat used in frying, baking, and other types of cooking. It is also used in food preparation and flavouring not involving heat, such as salad dressings and bread dips, and in this sense might be more accurately termed edible oil. Cooking oil is typically a liquid at room temperature, although some oils that contain saturated fat, such as coconut oil, palm oil and palm kernel oil are solid. There is a wide variety of cooking oils from plant sources such as olive oil, palm oil, soybean oil, canola oil (rapeseed oil), corn oil, peanut oil and other vegetable oils, as well as animal-based oils like butter and lard. Oil can be flavoured with aromatic foodstuffs such as herbs, chillies or garlic.
flavourless, such as canola or sunflower
C 270 9.5 ounces White Chocolate (Compound) Compound chocolate is a product made from a combination of cocoa, vegetable fat, and sweeteners. It is used as a lower-cost alternative to true chocolate, as it uses less-expensive hard vegetable fats such as coconut oil or palm kernel oil in place of the more expensive cocoa butter. It may also be known as 'compound coating' or 'chocolatey coating' when used as a coating for candy.
buttons or chopped
D 200 7 ounces Brown Sugar Brown sugar is a sucrose sugar product with a distinctive brown color due to the presence of molasses. It is either an unrefined or partially refined soft sugar consisting of sugar crystals with some residual molasses content (natural brown sugar), or it is produced by the addition of molasses to refined white sugar (commercial brown sugar). lightly packed
E 195 0.8 cup Milk Milk is a white liquid produced by the mammary glands of mammals. It is the primary source of nutrition for young mammals before they are able to digest other types of food. Milk is processed into a variety of dairy products such as cream, butter, yogurt, kefir, ice cream, and cheese. Modern industrial processes use milk to produce casein, whey protein, lactose, condensed milk, powdered milk, and many other food-additives and industrial products.
full cream
F 15 1 tablespoon Rum
G 70 2.5 ounces Cake Flour Cake flour is a finely milled white flour made from soft wheat. It has very low protein content, between 8% and 10%, making it suitable for soft-textured cakes and cookies. The higher protein content of other flours would make the cakes tough. Highly sifted cake flours may require different volume amounts in recipes than all-purpose flour. Using the scoop and level method, well-sifted flour usually produces 125 g per cup. However, most American recipes are written with 140 g of flour per cup, so weighing and experimentation can be helpful in baking unfamiliar recipes. Small weight differences can greatly affect the texture. American Cake flour is bleached; in countries where bleached flour is prohibited, plain flour can be treated in a domestic microwave to improve the texture of the end product. sifted
H 140 4.9 ounces Self-Raising Flour Self-rising or self-raising flour is white flour that is sold premixed with chemical leavening agents. Self-rising flour is typically composed of the following ratio: 1 cup (100 g) flour, 1 1⁄2 teaspoons (3 g) baking powder, a pinch to 1⁄2 teaspoon (1 g or less) salt. sifted
I 2 Sodium Bicarbonate Sodium bicarbonate (a.k.a baking soda, bread soda, cooking soda, and bicarbonate of soda), referred to as "baking soda", is primarily used in cooking (baking), as a leavening agent. It reacts with acidic components in batters, releasing carbon dioxide, which causes expansion of the batter and forms the characteristic texture and grain in pancakes, cakes, quick breads, soda bread, and other baked and fried foods. Acidic compounds that induce this reaction include phosphates, cream of tartar, lemon juice, yogurt, buttermilk, cocoa, vinegar, etc. Natural acids in sourdough can be leavened with the addition of small amounts as well. Sodium bicarbonate can be substituted for baking powder provided sufficient acid reagent is also added to the recipe. Many forms of baking powder contain sodium bicarbonate combined with calcium acid phosphate, sodium aluminium sulphate or cream of tartar. Sodium bicarbonate was sometimes used in cooking vegetables, to make them softer, although this has gone out of fashion, as most people now prefer firmer vegetables. However, it is still used in Asian and Latin American cuisine to tenderise meats. Baking soda may react with acids in food, including vitamin C (L-ascorbic acid). It is also used in breadings such as for fried foods to enhance crispness. Heat causes sodium bicarbonate to act as a raising agent by releasing carbon dioxide when used in baking. The carbon dioxide production starts at temperatures above 80 °C. Since the reaction does not occur at room temperature, mixtures (cake batter, etc.) can be allowed to stand without rising until they are heated in the oven. sifted
J 2 Baking Powder Baking powder is a dry chemical leavening agent, a mixture of a carbonate or bicarbonate and a weak acid, and is used for increasing the volume and lightening the texture of baked goods. Baking powder works by releasing carbon dioxide gas into a batter or dough through an acid-base reaction, causing bubbles in the wet mixture to expand and thus leavening the mixture. It is used instead of yeast for end-products where fermentation flavors would be undesirable or where the batter lacks the elastic structure to hold gas bubbles for more than a few minutes, or for convenience. Because carbon dioxide is released at a faster rate through the acid-base reaction than through fermentation, breads made by chemical leavening are called quick breads. sifted
K 220 4.4 Whole Eggs Whole Egg Eggs are one of the most common ingredients in a typical cake. Egg yolks and whole eggs store significant amounts of protein and choline, and are widely used in baking. Usually an eggs role in a cake is to add moisture and richness, act as a raising agent as well as a glue to bind the ingredients together. room temperature, lightly beaten
1354

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Method

STEP ACTION DETAIL CONDITION
1 Pre-heat Pre-heat the oven to 165–170°C (330–340°F). Line the base and sides of a deep 20 cm round tin with baking paper, taking the paper a little above the rim. Tin fully lined; mud cakes bake slowly and need the protection
2 Melt Put A, B, C, D, E and F (butter, oil, white chocolate, brown sugar, milk and rum) in a saucepan and warm over low heat, stirring gently. Chocolate and butter melted and the sugar dissolved; do not let it boil
3 Cool Take the pan off the heat and stir until smooth, then leave to cool. Just warm to the touch, not hot, or the egg will scramble
4 Sift Sift G, H, I and J (cake flour, self-raising flour, bicarbonate of soda and baking powder) together into a large bowl. Raising agents evenly spread through the flour
5 Mix Pour the cooled chocolate mixture into the dry ingredients and whisk until smooth. No lumps of flour; batter is thin and glossy
6 Add Whisk in K (whole egg) a little at a time. Batter smooth and evenly combined
7 Fill Pour the batter into the prepared tin and tap the tin gently on the bench to settle it. Surface level, large air bubbles released
8 Bake Bake at 165–170°C (330–340°F) for about 60 to 75 minutes. If the top colours too quickly, lay a sheet of baking paper loosely over it. A skewer in the centre comes out with only a few moist crumbs
9 Cool Leave the cake in the tin until completely cold, then turn out and wrap well. Mud cake is fragile while warm; it firms up as it cools

Important Notes

The scaled recipe makes about 1,354 g of batter, enough for one deep 20 cm round tin. Bake at 165–170°C (330–340°F) — a low, slow bake is what gives mud cake its dense, damp crumb. Cool the melted mixture before adding the egg, or it will curdle. The cake is best wrapped in plastic once cold and rested overnight before cutting: it firms up, slices cleanly and carves well. Wrapped, it keeps 4 to 5 days at room temperature or up to a week in the fridge, and freezes well for a month. The rum can be left out and replaced with the same weight of milk if you prefer.

Tools & Arrangements

Deep 20 cm round cake tin, baking paper, medium saucepan, heatproof spatula, large mixing bowl, sieve, balloon whisk, kitchen scales, skewer, cooling rack.

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