Brown Sugar Grapefruit Pudding Cake with Whipped Cream

Why You’ll Love This Recipe

• Two dreamy layers in one bake: a fluffy brown-sugar sponge on top and a tangy grapefruit custard beneath.
• Bright citrus balances the caramel warmth of brown sugar for a rounded, not-too-sweet finish.
• Bakes in a simple water bath—no special equipment beyond a roasting pan.
• Comforting served warm with lightly sweetened whipped cream.

Grocery List

• Produce: 1 large ruby red grapefruit
• Dairy: Unsalted butter, whole milk, heavy cream, 3 large eggs
• Pantry: Light brown sugar, all-purpose flour, baking powder, kosher salt, vanilla extract, powdered sugar, optional ground cardamom

Full Ingredients

Pudding Cake

• 3 tbsp (42 g) unsalted butter, melted and slightly cooled, plus more for greasing the dish
• 3/4 cup (150 g) packed light brown sugar
• 1 tbsp finely grated zest from 1 large ruby red grapefruit
• 1/2 cup (120 ml) freshly squeezed ruby red grapefruit juice, strained
• 3 large eggs, separated
• 1/2 cup (60 g) all-purpose flour
• 1 tsp baking powder
• 1/4 tsp kosher salt
• 1 cup (240 ml) whole milk
• 1 tsp vanilla extract
• Optional: 1/8 tsp ground cardamom

For the Pan and Water Bath

• 1 tsp granulated sugar (for dusting the greased dish, optional)
• About 4 cups (1 liter) hot water

For Serving (Whipped Cream)

• 3/4 cup (180 ml) cold heavy cream
• 2 tbsp (15 g) powdered sugar
• 1/2 tsp vanilla extract
• Optional: A pinch of reserved grapefruit zest for garnish

Step-by-Step Instructions

Step 1: Prep the oven, dish, and water bath

Preheat the oven to 350°F (175°C) with a rack in the middle. Grease a 2-quart baking dish (8-inch square or 9-inch round) with butter and, if you like, dust lightly with granulated sugar for a delicate crust. Set a folded kitchen towel in the bottom of a deep roasting pan and place the baking dish on top. Put a kettle of water on to boil for the water bath.

Step 2: Whisk the dry ingredients

In a small bowl, whisk together the flour, baking powder, kosher salt, and optional cardamom. Set aside.

Step 3: Build the custardy base

In a large bowl, combine the brown sugar and grapefruit zest. Use your fingertips to rub the zest into the sugar until the mixture is fragrant and looks slightly damp. Whisk in the egg yolks until sandy and thickened, then whisk in the melted butter.

Whisk in the dry ingredients until mostly combined. Add half the milk and whisk smooth, then whisk in the grapefruit juice and vanilla, followed by the remaining milk. The batter will be thin—that is perfect for a pudding cake.

Step 4: Beat the egg whites

In a clean bowl with clean beaters, whip the egg whites to soft peaks (they should hold a peak that gently folds over). Do not overbeat—the whites should look glossy, not dry.

Step 5: Fold and pan the batter

Fold one-third of the whites into the batter to lighten it, then gently fold in the remaining whites in two additions, using broad strokes to avoid deflating. Pour the airy batter into the prepared baking dish and smooth the top.

Step 6: Bake in a water bath

Slide the roasting pan (with the baking dish inside) into the oven. Carefully pour hot water into the roasting pan until it comes halfway up the sides of the baking dish. Bake 35 to 40 minutes, until the top is golden and springs back lightly to the touch while the center still has a gentle jiggle. Remove the baking dish from the water bath and let it rest for 10 minutes to set the custard.

Step 7: Whip the cream and serve warm

While the cake rests, whip the heavy cream with powdered sugar and vanilla to soft peaks. Spoon the warm pudding cake into bowls, making sure to scoop through both layers, and top each serving with a generous dollop of whipped cream. Garnish with a whisper of grapefruit zest if you like.

Pro Tips

• Rub zest into brown sugar to release flavorful grapefruit oils—this deepens citrus aroma without extra juice.
• Soft peaks are key. Overbeaten whites won’t fold well and can inhibit the sponge rise.
• Use ruby red grapefruit for a naturally sweeter, less bitter profile; strain the juice for a silky custard.
• Don’t skip the water bath. It ensures a creamy custard layer while the top bakes into a tender sponge.
• Bake until just set. A slight center jiggle = custard; no jiggle = overbaked.

Variations

• Individual Ramekins: Divide batter among 6 buttered 6-ounce ramekins. Bake in a water bath 20 to 25 minutes.
• Lemon or Blood Orange: Swap grapefruit with 1/2 cup lemon or blood orange juice and 1 tbsp zest. For lemon, add 1 to 2 extra tablespoons brown sugar if you prefer sweeter.
• Brown-Sugar Brûlée Top: Sprinkle 1 to 2 tsp brown sugar over the baked cake and broil 30 to 60 seconds until bubbly and amber. Watch closely.

Storage & Make-Ahead

This pudding cake is best warm the day it’s baked. Refrigerate leftovers, covered, for up to 3 days; rewarm gently at 300°F (150°C) for 10 to 15 minutes or microwave at 50% power in short bursts. The sponge will soften but the custard remains luscious. For prep ahead, measure and hold the dry ingredients and wet ingredients separately (juice/zest can be prepared 1 day ahead); combine, whip whites, and bake just before serving. Freezing is not recommended due to custard separation.

Nutrition (per serving)

Approx. 370 calories; 20 g fat; 45 g carbohydrates; 6 g protein; 0.8 g fiber; 32 g sugars; 220 mg sodium. Nutrition will vary based on brands and garnish amounts.