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This is an oil-based sponge built around grated raw pumpkin, fresh ginger and candied ginger, with cinnamon and walnut pieces through the batter. The pumpkin keeps it very moist, the fresh ginger gives it a clean warmth and the candied ginger cubes leave little sweet, chewy pockets in the crumb.

The texture is soft and close, more like a carrot cake than a whipped sponge, and because there is no butter in it the cake stays moist for days. It cuts cleanly into layers, takes a soaking syrup well, and sits happily under cream cheese frosting, caramel or a light spiced buttercream.

Ingredients

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Weight Per Unit: 1204
Number of Units: 2
Unit Size: 20 cm round tin, about 6 cm high
WEIGHT
(grams)
ALTERNATIVE METRIC INGREDIENT IMAGE CONDITION
A 375 13.2 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
B 425 15 ounces Sugar Sugar is the generalized name for sweet, short-chain, soluble carbohydrates, many of which are used in food. They are carbohydrates, composed of carbon, hydrogen, and oxygen. There are various types of sugar derived from different sources. Simple sugars are called monosaccharides and include glucose (also known as dextrose), fructose and galactose. The table or granulated sugar most customarily used as food is sucrose, a disaccharide. (In the body, sucrose hydrolyses into fructose and glucose.) Other disaccharides include maltose and lactose. Longer chains of sugars are called oligosaccharides. Chemically-different substances may also have a sweet taste, but are not classified as sugars. Some are used as lower-calorie food substitutes for sugar described as artificial sweeteners.
C 7.5 0.3 ounce 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
D 13 0.5 ounce 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
E 13 0.5 ounce Cinnamon Cinnamon (/ˈsɪnəmən/ sin-ə-mən) is a spice obtained from the inner bark of several trees from the genus Cinnamomum that is used in both sweet and savoury foods. While Cinnamomum verum is sometimes considered to be "true cinnamon", most cinnamon in international commerce is derived from related species, which are also referred to as "cassia" to distinguish them from "true cinnamon".
ground
F 200 7 ounces Walnut Pieces Walnut pieces are shelled walnut kernels broken into rough chunks. They are sold ready-chopped and are cheaper than whole halves, which makes them ideal for folding through cake batters where the nuts are not on show. roughly chopped
G 750 26.4 ounces Pumpkin Pumpkin is a firm-fleshed winter squash. For candying, choose a dense, dry-fleshed variety such as Jap, Kent or butternut, peeled, seeded and cut into even pieces so they cook and candy at the same rate.
peeled and deseeded
coarsely grated
H 50 1.8 ounces Fresh Ginger Fresh ginger is the knobbly root of the ginger plant, peeled and then grated or crushed to a pulp. It is much sharper and more fragrant than dried ground ginger, and gives baking a clean, warm heat.
peeled
finely grated or crushed
I 50 1.8 ounces Ginger Ginger (Zingiber officinale Roscoe) is a flowering plant, in the family Zingiberaceae whose rhizome, ginger root or simply ginger, is widely used as a spice or a folk medicine. diced small
J 225 4.5 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
K 300 1.3 cups 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
2408

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Method

STEP ACTION DETAIL CONDITION
1 Pre-heat Pre-heat the oven to 170°C (340°F). Grease two 20 cm round tins and line the bases and sides with baking paper. Oven fully up to temperature before the batter goes in
2 Prepare Peel and deseed the pumpkin and grate it coarsely. Peel and finely grate or crush H (fresh ginger) and dice I (candied ginger cubes) small. Pumpkin grated raw, not cooked; drain off any loose liquid
3 Sift Sift A, C, D and E (cake flour, baking powder, bicarbonate of soda and cinnamon) together into a bowl, then stir F (walnut pieces) through the dry mix. Nuts lightly coated in flour so they stay suspended
4 Whisk In a large bowl, whisk J and B (whole egg and caster sugar) together until the sugar has dissolved and the mixture is pale. Slightly thickened and no sugar grains felt on the whisk
5 Add Pour in K (cooking oil) in a thin stream while whisking. Smooth and emulsified, not separated
6 Mix Stir G, H and I (grated pumpkin, fresh ginger and candied ginger cubes) into the egg and oil mixture. Pumpkin evenly wetted through
7 Fold Add the sifted dry ingredients and walnuts and fold through with a spatula. Just combined, no dry flour showing; do not overmix
8 Fill Divide the batter evenly between the two lined tins, about 1.2 kg in each, and level the tops. Tins filled no more than two thirds high
9 Bake Bake at 170°C (340°F) for about 45 to 55 minutes. Well risen, springy to the touch and a skewer comes out clean
10 Cool Rest the cakes in the tins for 10 minutes, then turn out onto a rack and peel off the paper. Completely cool before cutting or layering

Important Notes

This half batch makes about 2.4 kg of batter, enough for two 20 cm round tins about 6 cm high, or one 30 x 25 cm slab tray. The sheet carried no method or puff points, so the mixing order and baking times here are the standard ones for an oil and grated vegetable sponge and should be checked against your own oven. Use raw grated pumpkin, not cooked or pureed, or the batter will be too wet. The cake keeps very moist: wrap well once cold and keep at room temperature for 2 to 3 days, refrigerate for up to a week, or freeze the layers wrapped in plastic for up to two months. Chill or lightly freeze the cakes before slicing into layers for a cleaner cut.

Tools & Arrangements

Kitchen scales, box grater or food processor with grating disc, fine grater for the fresh ginger, sieve, two large mixing bowls, balloon whisk, rubber spatula, two 20 cm round cake tins, baking paper, skewer, cooling rack.

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