Gâteau de Patate Douce : La Recette Sublime et Fondante des Antilles

Ingredients

• 800 g, peeled and gratedsweet potato
• 400 mlcoconut milk
• 100 gdesiccated coconut
• 250 gsoft brown cane sugar
• 3eggs
• 80 g, meltedbutter
• 45 ml (3 tablespoons)cornflour
• 1 pod or 5 ml (1 teaspoon) extractvanilla
• 5 ml (1 teaspoon)ground cinnamon
• 1 pinchgrated nutmeg
• 2–3 dropsbitter almond extract
• 30 ml (2 tablespoons), optionalaged rum
• 1 pinchsalt

Instructions

1. 1

   Grate the sweet potato

   Peel the sweet potatoes and grate them finely by hand or in a food processor using a fine grating disc. Aim for a texture close to a coarse purée.

2. 2

   Mix the wet ingredients

   Whisk the eggs with the cane sugar until the mixture lightens slightly. Stir in the melted butter, coconut milk, vanilla, cinnamon, nutmeg, bitter almond extract and rum, if using.

3. 3

   Add coconut and potato

   Mix the grated sweet potato and desiccated coconut into the liquid mixture. Sprinkle in the cornflour and salt, then stir until no lumps remain.

4. 4

   Prepare the tin

   Grease a cake tin or 24 cm square tin generously with butter. Heat the oven to 180°C.

5. 5

   Bake the cake

   Pour the mixture into the tin and bake for 60–75 minutes, until the top is golden and a knife inserted into the cake comes out slightly moist.

6. 6

   Cool before turning out

   Leave the cake to cool for at least 1 hour before turning it out. Serve it warm or cold.

What is Antillean sweet potato cake?

Known in French as gâteau de patate douce, this is a Caribbean-style cake associated with Guadeloupe and Martinique. Rather than relying on flour as its main base, it uses grated sweet potato for a dense, tender texture.

This version combines the root vegetable with coconut milk and grated coconut, then scents the mixture with vanilla and warm spices. The result is rich and fragrant, somewhere between a soft cake and a set pudding.

Nutrition and macros by portion

The nutrition label shows one serving as written: 500 calories, 6g protein, 61g carbs, 29g fat.

The sweet potato and cane sugar provide most of the carbohydrates, while coconut milk, grated coconut and butter contribute much of the fat. Eggs add some protein, though this is primarily a carbohydrate- and fat-rich dessert. Balance a slice with fruit or serve it after a meal that includes vegetables and a protein source.

Grating the sweet potato

Fine grating: Use a fine grater or food processor disc so the sweet potato softens and binds into the mixture as it bakes. The aim is a coarse-purée texture, not long, chunky strands.

Freshly grated: Prepare the potato just before mixing, so it does not sit around and discolour. There is no need to squeeze it dry; its moisture is part of the cake’s soft texture.

Building the coconut mixture

Eggs and sugar: Whisk them until the mixture looks a little paler; it does not need to become thick or fluffy. This helps distribute the sugar before the heavier ingredients go in.

Coconut and starch: Stir in the coconut and sweet potato before adding the cornflour and salt. Mix until smooth so the starch is evenly dispersed and does not leave pockets of dry powder.

Getting the bake right

Oven time: The cake needs 60–75 minutes at 180°C, with the exact time depending on the tin and oven. Begin checking towards the shorter end of the range.

Doneness cue: Look for a golden top and test the centre with a knife. It should come out slightly moist rather than completely clean, as the cake is meant to stay soft.

Why the cake needs to cool

Set the texture: Leave the cake in its tin for at least 1 hour before turning it out. Cooling gives the sweet potato mixture time to firm up, making it less likely to break apart.

Serving temperature: It can be enjoyed warm or cold. For neat slices, let it cool fully; for a softer, more pudding-like serving, have it slightly warm.

Serving and flavour

A simple finish: Serve a slice on its own so the coconut, vanilla and cinnamon remain the focus. Fresh fruit can add a bright contrast without changing the cake itself.

Optional rum: The aged rum is optional, but adds a rounded, aromatic note. Bitter almond extract is potent, so keep to the stated few drops.

Recipe notes & tips

• Use a fine grater to help the sweet potato blend into the batter.
• Scrape the seeds from the vanilla pod into the mixture if using a pod.
• Grease the tin generously so the soft cake releases more easily.
• Start checking for doneness at 60 minutes, then continue baking if needed.
• Let the cake rest for at least 1 hour before turning it out.
• Use the bitter almond extract sparingly; just 2–3 drops are called for.

Variations

• Skip the rum: Leave it out for a version without alcohol.
• Use vanilla extract: Measure 5 ml instead of using a vanilla pod.
• Adjust the spice: Add a little more cinnamon if you prefer a warmer flavour.
• Serve with fruit: Add fresh fruit alongside a slice for a brighter contrast.

Common mistakes to avoid

• Grating too coarsely: The pieces may stay firm; use a fine grater or fine food-processor disc.
• Leaving lumps of cornflour: Sprinkle it in and mix until the batter is smooth.
• Overbaking: The cake can lose its soft texture; check from 60 minutes and look for a slightly moist knife.
• Turning it out too soon: The cake may break while still warm; wait at least 1 hour.
• Adding too much almond extract: Its flavour can dominate; stick to 2–3 drops.

How to store

Once cool, cover and refrigerate the cake for up to 3–4 days. Serve chilled or let a slice come towards room temperature; warm it gently if preferred.

Frequently asked questions