Quick Recipe Version (TL;DR)
Quick Ingredients
- 150 g unsalted butter, softened
- 150 g granulated sugar
- 3 large eggs, room temperature
- 150 g finely ground almond flour
- 40 g all-purpose flour, 1 tsp baking powder, pinch of salt
- 3 tbsp dark or amber rum (for batter)
- 60 ml water, 60 g sugar, 60 ml rum (for soaking syrup)
- 180 g powdered sugar, 3–4 tbsp rum (for glaze)
- Optional: lemon zest, toasted sliced almonds (for garnish)
Do This
- 1. Heat oven to 170°C / 340°F. Butter and line a 20–22 cm (8–9 inch) round cake pan.
- 2. Cream butter and sugar until pale; beat in eggs one at a time, then rum and vanilla if using.
- 3. Fold in almond flour, all-purpose flour, baking powder, and salt. Spread batter in pan.
- 4. Bake 35–40 minutes until golden and a skewer comes out with just a few moist crumbs.
- 5. Simmer water and sugar, then stir in rum. While cake is warm, poke holes and slowly soak with syrup.
- 6. When completely cool, whisk powdered sugar with rum to a thick but pourable glaze. Spread on top and let set before slicing.
Why You’ll Love This Recipe
- Classic French pâtisserie at home: a traditional cake from Nantes with simple ingredients and elegant flavor.
- Incredibly moist from almond flour and rum syrup, yet with a fine, velvety crumb that slices cleanly.
- Keeps beautifully for several days, actually tasting even better the next day as the flavors meld.
- Perfect make-ahead dessert for dinner parties, paired with coffee, tea, or a small glass of rum.
Grocery List
- Produce: 1 unwaxed lemon (for optional zest garnish)
- Dairy: Unsalted butter, eggs
- Pantry: Granulated sugar, powdered (icing) sugar, almond flour (finely ground almonds), all-purpose flour, baking powder, fine salt, dark or amber rum, vanilla extract (optional), sliced almonds (optional)
Full Ingredients
For the Cake
- 150 g unsalted butter, very soft (about 2/3 cup)
- 150 g granulated sugar (about 3/4 cup)
- 3 large eggs, at room temperature
- 150 g finely ground almond flour (about 1 1/2 cups, lightly packed)
- 40 g all-purpose flour (about 1/3 cup, spooned and leveled)
- 1 tsp baking powder
- 1/4 tsp fine sea salt
- 2–3 tbsp dark or amber rum (30–45 ml)
- 1 tsp pure vanilla extract (optional but recommended)
For the Rum Soaking Syrup
- 60 ml water (1/4 cup)
- 60 g granulated sugar (about 1/4 cup plus 2 tsp)
- 60 ml dark or amber rum (1/4 cup)
For the Rum Glaze
- 180 g powdered (icing) sugar, sifted (about 1 1/2 cups)
- 3–4 tbsp dark or amber rum (45–60 ml), or half rum / half water for a milder glaze
Optional Garnish
- Finely grated lemon zest (from 1/2 lemon)
- 1–2 tbsp sliced almonds, lightly toasted
Step-by-Step Instructions
Step 1: Prepare the pan and preheat the oven
Heat your oven to 170°C / 340°F (conventional, not fan). Butter the base and sides of a
20–22 cm (8–9 inch) round cake pan, ideally with a removable base, then line the bottom with a circle of baking parchment.
Butter the paper as well. This cake is quite moist, so lining ensures it releases cleanly without tearing the delicate crumb.
Step 2: Cream the butter and sugar
Place the 150 g softened butter and 150 g sugar in a mixing bowl.
Using an electric mixer (hand or stand) on medium speed, beat for about 3–4 minutes, until the mixture is
pale, creamy, and slightly increased in volume. Scrape down the sides of the bowl once or twice so everything is well blended.
Proper creaming gives the cake a fine, tender texture, even though it is naturally dense from the almonds.
Step 3: Add the eggs and flavorings
Beat the 3 eggs in a small bowl and then add them to the butter mixture
little by little, beating on low–medium speed. Let each addition fully incorporate
before adding more to avoid the batter splitting. If it starts to look slightly curdled, do not worry;
the almond flour will help bring it back together.
Stir in the 2–3 tbsp rum and vanilla extract, mixing just until combined.
Step 4: Fold in the dry ingredients and bake
In a separate bowl, whisk together the almond flour, all-purpose flour, baking powder, and salt
to break up any lumps. Add this dry mixture to the bowl with the egg–butter mixture.
Fold gently with a spatula or mix on low speed just until no dry streaks remain; overmixing can make the cake tough.
Transfer the batter to the prepared pan, smoothing the top with a spatula.
Bake on the middle rack for 35–40 minutes, until the top is golden and a skewer inserted in the center
comes out with a few moist crumbs but no wet batter. If the top colors too fast, tent loosely with foil.
Step 5: Make the rum syrup while the cake bakes
About 10 minutes before the cake is done, prepare the soaking syrup.
In a small saucepan, combine 60 ml water and 60 g sugar.
Bring to a gentle simmer over medium heat, stirring until the sugar fully dissolves.
Remove from the heat and let it cool for 2–3 minutes, then stir in the 60 ml rum.
Set aside to keep warm. The syrup should be pourable but not boiling hot when you use it.
Step 6: Soak the warm cake with rum syrup
When the cake is baked, place the pan on a wire rack. Let it cool for 10 minutes, then
carefully run a thin knife around the edge to loosen it. Leave the cake in the pan for soaking; this helps contain the syrup.
Using a skewer or toothpick, poke lots of small holes all over the surface, going almost to the bottom.
Slowly spoon or brush the warm rum syrup over the cake, allowing it to absorb before adding more.
Use all of the syrup; the cake should look moist but not flooded.
Let the cake cool completely in the pan (about 45–60 minutes) so the syrup can distribute evenly.
Once cool, carefully unmold and transfer the cake, top side up, to a serving plate.
Step 7: Glaze, garnish, and rest
In a bowl, whisk the 180 g powdered sugar with 3 tbsp rum.
Add more rum or a tiny splash of water, a teaspoon at a time, until you have a thick, smooth,
slowly pourable glaze that coats the back of a spoon in an opaque layer.
Pour the glaze onto the center of the cooled cake and gently nudge it towards the edges with an offset spatula or knife,
letting a little drip down the sides but keeping a classic thin white cap on top.
If you like, sprinkle a little lemon zest or a few toasted sliced almonds
around the edge while the glaze is still wet.
Let the glaze set at room temperature for at least 30 minutes before slicing.
For the most authentic flavor, wrap the cooled, glazed cake lightly and let it rest for several hours or overnight before serving.
Pro Tips
- Use room-temperature ingredients. Soft butter and room-temperature eggs blend more smoothly, giving you a finer crumb.
- Choose good rum. A flavorful dark or amber rum (not white) gives the cake its signature aroma; use something you would enjoy sipping.
- Do not overbake. Remove the cake as soon as a skewer shows moist crumbs. Slight underbaking is better than dry; the syrup will finish the texture.
- Let the cake rest. Gâteau nantais is famously better the next day as the rum and almond flavors meld and the syrup fully penetrates.
- Control the booze level. If you prefer a milder cake, replace part of the rum in the syrup and glaze with water or simple syrup.
Variations
- Orange-scented gâteau nantais: Add 1 tbsp finely grated orange zest to the batter and replace half the water in the syrup with freshly squeezed orange juice.
- Coconut-rum twist: Replace 30 g of the almond flour with finely shredded unsweetened coconut and use coconut rum for the syrup and glaze.
- Less-alcohol version: Use only 1 tbsp rum in the batter and glaze, and make the syrup with 90 ml water and 30 ml rum instead of equal parts.
Storage & Make-Ahead
This cake is an excellent make-ahead dessert. Once completely cool and the glaze is set,
wrap the cake well in plastic wrap or store it in an airtight container at cool room temperature for up to
4 days. The flavor improves over the first 24–48 hours.
For longer storage, wrap tightly and freeze (without glaze is best) for up to 2 months.
Thaw overnight in the refrigerator, then bring to room temperature and glaze a few hours before serving.
Leftover slices can be wrapped individually and kept in the fridge for up to 5 days.
Nutrition (per serving)
Approximate values for 1 of 10 servings: about 430 kcal;
28 g fat; 11 g saturated fat;
38 g carbohydrates; 28 g sugar;
5 g protein; 1 g fiber.
These numbers are estimates and will vary based on the exact ingredients and brands used.
