Watermelon Cake
Watermelon cake is a no-bake dessert made by peeling a whole watermelon, trimming it into a cylinder or round, and frosting it with whipped cream (or a dairy-free alternative) so it looks like a traditional layer cake when sliced. It's popular as a lighter, gluten-free, warm-weather stand-in for baked cake at summer parties, since the interior is just plain watermelon flesh rather than sponge or crumb.
Varieties
Mini or personal-size seedless watermelons work well for smaller two-layer cakes serving 4 to 6 people, while a standard large watermelon is better suited to a tiered cake for a bigger party.
Buying tips
Choose a seedless watermelon that's uniformly round rather than oblong or tapered, which makes it easier to trim into an even cylinder. Look for a firm rind, a matte (not glossy) surface, and a creamy yellow spot where it rested on the ground, a sign of ripeness.
Substitutes
Cantaloupe or honeydew melon — 1:1 by size
Denser, firmer flesh than watermelon, so it holds a clean cylinder shape longer under frosting and slices more cleanly.
Whole peeled pineapple — 1:1 by size
Much less water content than watermelon, so it won't weep under frosting, but the flavor is more assertive and tart against sweet whipped cream.
Coconut whipped cream (chilled coconut cream, whipped) — 1:1 for the frosting layer
Dairy-free stand-in for whipped cream frosting; whips up slightly less stiff, so chill the piping bag and bowl well before use.
Sweetened Greek yogurt — 1:1 for the frosting layer
Tangier and less sweet than whipped cream, and holds its shape at room temperature longer, though it won't pipe as smoothly.
Storage
Assemble and frost as close to serving as possible. Once frosted, keep refrigerated and serve within 4 to 6 hours; watermelon releases water as it sits, which thins the frosting and pools liquid on the plate. An unfrosted, trimmed watermelon cylinder can be wrapped tightly in plastic and refrigerated for up to 2 days before frosting.
How to use
Serve as a birthday or summer party centerpiece in place of baked cake, especially for gluten-free, dairy-conscious, or lower-sugar occasions. Slice like a layer cake into wedges or rounds and top individual servings with extra berries or a drizzle of honey.
What it pairs with
Fresh berries, mint leaves, toasted coconut flakes, lime zest, and a light honey or agave drizzle all work well as toppings without overwhelming the mild watermelon flavor.
Nutrition
Because the base is watermelon rather than flour, sugar, and butter, a slice of watermelon cake has a fraction of the calories of traditional cake. Watermelon itself is over 90% water and provides vitamin C and vitamin A, though most of the sweetness and any added sugar comes from the frosting.
FAQ
Is watermelon cake actually baked?
No. The base is raw watermelon trimmed into a cake shape and chilled; only the frosting or any garnish is prepared separately, so there's no oven involved at all.
How do you keep watermelon cake from getting watery?
Pat the trimmed watermelon dry with paper towels and let it drain on a wire rack over a tray for 15 to 20 minutes before frosting to pull out surface moisture that would otherwise thin the frosting.
Can you make watermelon cake ahead of time?
Trim the watermelon into its cake shape up to 2 days ahead and store it wrapped in the refrigerator, but hold off on frosting until a few hours before serving so the exterior doesn't weep liquid.
Does the frosting need to be stabilized whipped cream?
Stabilized whipped cream (made with a bit of gelatin, cornstarch, or mascarpone) holds up noticeably longer against the moisture from the watermelon than plain whipped cream, which can start to slide within an hour or two.
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