When the craving for a chocolate cake hits and the eggs box is empty, a condiment from the fridge can take over and bring moisture to the batter.
You take out the flour, sugar and cocoa, then you discover that the eggs are missing to prepare the afternoon treat. Before giving up or going back to the store, look toward sauces. An ingredient usually reserved for sandwiches and salads also has its place in a chocolate cake.
This condiment is mayonnaise. The pairing may be surprising, but it can be explained easily: a classic mayonnaise already contains oil and eggs. In a recipe designed to use it, it replaces their separate addition and helps to give a tender crumb. The cocoa remains in the foreground, provided you choose a plain mayonnaise with a mild taste.
Why mayonnaise adds tenderness to the cake
Mayonnaise is an emulsion: the oil and the aqueous ingredients are already intimately mixed. It provides the batter with fat and moisture, two elements useful for obtaining a pleasant texture. In its explanation devoted to this technique, King Arthur Baking also notes that the fat coats the flour and limits gluten development, which favors a tender crumb.
However, this use requires choosing the right jar. Favor a classic mayonnaise, not light and not overly mustardy. A version with garlic, herbs or chili would bring flavors that have no place here. The cake still contains the eggs and the oil present in the condiment: it is therefore not a recipe without eggs, but another way to incorporate them.
The ingredients to plan for a shareable cake
The base below corresponds to half of King Arthur Baking’s mayonnaise chocolate cake recipe, with the sugar and cocoa slightly rounded. Prepare a square pan about 20 cm on each side. This size allows eight small portions for an afternoon snack or a dessert, without making a large family-sized cake.
Use unsweetened cocoa powder, and not a chocolate drink mix. Get a scale, a mixing bowl, a whisk and a spatula: no mixer is necessary. To measure the baking soda, use level measuring spoons. Prepare all ingredients before mixing, so you can bake as soon as the batter is ready.
- 170 g of plain classic mayonnaise, mild taste
- 170 ml of warm water
- 180 g of wheat flour
- 150 g of granulated sugar
- 32 g of unsweetened cocoa powder
- 1 teaspoon vanilla extract
- 1 level teaspoon baking soda, plus 1/4 teaspoon
- 1/4 teaspoon fine salt
The preparation that yields a smooth batter
Preheat the oven to 175 °C with conventional heat and line the pan with parchment paper. In the bowl, whisk together the mayonnaise, warm water and vanilla. Sift the flour, the cocoa and the baking soda over the mixture, then add the sugar and salt. Stir until you obtain a smooth batter and pour it into the pan.
Run the spatula around the edges and bottom of the bowl to recover any pockets of flour. Once the ingredients are incorporated, there is no need to overmix or try to whip the batter. Simply level the surface in the pan. For this first attempt, keep the indicated proportions: adding mayonnaise haphazardly to your usual cake would not necessarily yield the same balance.
About 30 minutes of baking to keep a tender crumb
Bake on the middle rack and start checking around 30 minutes. Insert a toothpick or a thin blade into the center: it should come out clean or with a few moist crumbs, not with liquid batter. If the center is not fully baked yet, extend by a few minutes and check again. Then let the cake cool in the pan set on a rack.
The surface color is a less obvious cue for a cocoa batter than for a plain cake. As King Arthur Baking’s baking guide reminds, you should read the cues rather than rely solely on the timer. A cake that is overbired loses its tenderness; a center that is underbaked remains doughy. The goal is a baked and tender crumb, without aiming for a molten center.
How to serve this cake without complicating snack time
To discover the recipe, serve a first slice plain. You can then offer a dusting of powdered sugar, a few raspberries, or chocolate shavings. If you want to add a glaze, wait for complete cooling. The square format also lends itself to a simple presentation: cut regular portions and place the toppings next to them so everyone can assemble their dessert.
Once cooled, store the cake plain and well covered to limit drying. Note the mayonnaise used and the cooking time observed in your oven: these two references will help you reproduce the result on the next attempt. The jar usually intended for savory meals will thus have a second use on days when you want to bake a cake with ingredients already on hand.
