Ingredients
Crust Ingredients:
- 1 1/4 cups (150g) all-purpose flour
- 1/4 cup (30g) powdered sugar
- 1/2 teaspoon ground cinnamon
- 1/4 teaspoon ground nutmeg
- 1/4 teaspoon salt
- 1/2 cup (113g) cold unsalted butter, cubed
- 1 large egg yolk
- 1–2 tablespoons cold water
Mousse Filling:
- 8 ounces (225g) high-quality white chocolate, chopped
- 1 cup (240ml) heavy cream, chilled
- 1/4 cup (60ml) milk (whole or 2%)
- 1 teaspoon pure vanilla extract
- 1/2 teaspoon unflavored gelatin (optional, for extra stability)
Toppings (Optional but Recommended):
- Fresh raspberries, strawberries, or blueberries
- White chocolate curls or shavings
- Mint leaves for garnish
- Light dusting of powdered sugar
Instructions
1. Prepare the crust:
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In a large mixing bowl, combine flour, powdered sugar, cinnamon, nutmeg, and salt. Whisk to blend.
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Add cold butter cubes. Use a pastry cutter or your fingertips to rub the butter into the flour mixture until it resembles coarse crumbs.
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Add the egg yolk and 1 tablespoon cold water. Mix gently with a fork. Add more water only if needed for the dough to hold together when pinched.
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Form the dough into a disk, wrap in plastic, and chill in the refrigerator for at least 30 minutes.
2. Blind bake the tart shell:
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Preheat oven to 350°F (175°C).
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Roll out the chilled dough on a lightly floured surface to fit a 9-inch tart pan with a removable bottom.
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Press the dough gently into the tart pan. Trim excess dough from the edges.
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Prick the base with a fork and line it with parchment paper. Fill with pie weights or dried beans.
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Bake for 15 minutes. Remove parchment and weights, and bake for an additional 10 minutes until golden brown.
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Let the crust cool completely on a wire rack.
3. Make the white chocolate mousse:
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If using gelatin, sprinkle it over 1 tablespoon of cold water in a small bowl. Let it bloom for 5 minutes.
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In a small saucepan, heat the milk until just simmering (do not boil). Remove from heat and stir in the bloomed gelatin until dissolved.
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Add chopped white chocolate to the warm milk. Let sit for a minute, then stir until smooth and melted.
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Stir in vanilla extract and allow to cool to room temperature.
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In a large bowl, beat chilled heavy cream to soft peaks using a hand mixer.
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Gently fold the whipped cream into the cooled white chocolate mixture in batches, being careful not to deflate the mousse.
4. Assemble and chill the tart:
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Spoon or pour the mousse into the cooled tart shell. Smooth the top with an offset spatula or back of a spoon.
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Refrigerate the tart for at least 4 hours, or until the mousse is fully set and firm to the touch.
5. Garnish and serve:
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Before serving, decorate the tart with fresh berries, chocolate curls, and mint leaves if desired.
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Slice with a warm knife for clean cuts. Serve chilled.
Notes
- Choose quality white chocolate: Real white chocolate contains cocoa butter. Avoid cheap varieties with only sugar and oil. Look for brands that list cocoa butter as a main ingredient.
- Cold ingredients help: Keep your cream and mixing bowl cold before whipping. This ensures a stable mousse.
- No gelatin? No problem: The mousse can set without gelatin, though it will be a bit softer. Chill longer for best results.
- Plan ahead: This tart is best made the day before serving. It needs time to chill and set properly.
- Tart pan tip: A removable-bottom tart pan is best for easy release. Grease lightly if your pan tends to stick.
- No food processor? Use a fork or pastry blender to make the crust. It may take a bit more time but works just as well.
- Customize your crust: Feel free to add a pinch of cloves or cardamom to change the flavor profile.
- Prep Time: 30 minutes
- Cook Time: 25 minutes