Quick Recipe Version (TL;DR)
Quick Ingredients
- 200 g (1 2/3 cups) all-purpose flour
- 70 g (1/2 cup + 1 tbsp) powdered sugar
- 115 g (1 stick) cold unsalted butter
- 1 large egg yolk + 1 egg white (divided)
- 1/4 tsp fine salt + 1 tsp vanilla extract (divided)
- 300 g (about 3 cups) walnut halves, toasted and roughly chopped
- 200 g (1 cup) granulated sugar
- 80 ml (1/3 cup) water
- 60 g (4 tbsp) unsalted butter, room temperature
- 120 ml (1/2 cup) heavy cream (35% fat), room temperature
- 30 g (1 1/2 tbsp) honey
- 1/4 tsp fine salt (or to taste)
Do This
- 1) Make the sweet tart dough: rub flour, powdered sugar, salt, and cold butter together, then add yolk and a splash of cold water to form a dough. Flatten, wrap, and chill 1 hour.
- 2) Roll dough to about 3 mm (1/8 inch), line a 23 cm (9-inch) tart tin, trim, dock with a fork, and chill 15 minutes. Preheat oven to 180°C / 350°F.
- 3) Blind-bake shell 15 minutes with baking weights, remove weights, brush with beaten egg white, and bake 5–7 minutes more until lightly golden. Cool on a rack.
- 4) Toast walnuts 8–10 minutes at 160°C / 320°F until fragrant. Roughly chop and set aside.
- 5) Make caramel: simmer sugar and water until deep amber, off the heat whisk in cream, butter, honey, salt, and vanilla. Stir in walnuts.
- 6) Pour warm walnut-caramel into tart shell, smooth the top, and bake 10–12 minutes at 180°C / 350°F until bubbling. Cool completely before slicing.
Why You’ll Love This Recipe
- A classic from France’s Dauphiné region, featuring famed Grenoble walnuts in a rich, glossy caramel filling.
- Buttery, crisp sweet crust that stays tender under the gooey walnut-caramel layer.
- Deep nutty flavor with just enough sweetness to feel indulgent without being cloying.
- Perfect make-ahead dessert for dinner parties, holidays, or a special Sunday lunch.
Grocery List
- Produce: 300 g walnut halves (Grenoble walnuts if you can find them)
- Dairy: Unsalted butter, heavy cream (35% fat), 1 large egg
- Pantry: All-purpose flour, powdered (icing) sugar, granulated sugar, honey, vanilla extract, fine salt
Full Ingredients
For the Sweet Tart Crust (Pâte Sucrée)
- 200 g all-purpose flour (about 1 2/3 cups, spooned and leveled)
- 70 g powdered sugar (about 1/2 cup + 1 tbsp)
- 115 g unsalted butter, cold and diced (1 US stick)
- 1 large egg yolk
- 1–2 tbsp ice-cold water, as needed
- 1/4 tsp fine salt
- 1/2 tsp vanilla extract
- 1 large egg white, lightly beaten (for sealing the crust; use the white from the same egg)
For the Walnut Caramel Filling
- 300 g walnut halves (about 3 cups), preferably Grenoble walnuts
- 200 g granulated sugar (1 cup)
- 80 ml water (1/3 cup)
- 60 g unsalted butter, at room temperature, cut into pieces (4 tbsp)
- 120 ml heavy cream (1/2 cup), at room temperature
- 30 g honey (1 1/2 tbsp), preferably a light floral honey
- 1 tsp vanilla extract
- 1/4–1/2 tsp fine salt, to taste
- Optional: 1 tbsp walnut liqueur or dark rum, added at the end off the heat
Step-by-Step Instructions
Step 1: Make the sweet tart dough
In a medium bowl, whisk together the flour, powdered sugar, and salt. Add the cold diced butter. Using your fingertips or a pastry cutter, rub/cut the butter into the flour mixture until it resembles coarse crumbs with some pea-sized pieces of butter remaining.
In a small bowl, stir together the egg yolk, vanilla, and 1 tablespoon of ice-cold water. Drizzle this over the flour mixture and gently mix with a fork until the dough starts to clump. If it seems too dry, add up to 1 more tablespoon of cold water, a teaspoon at a time, just until it holds together when pressed.
Turn the dough out onto a lightly floured surface and gently bring it together with your hands. Avoid kneading; press and fold just until you have a smooth disk. Flatten to about 2–3 cm thick, wrap tightly in plastic wrap, and chill in the refrigerator for at least 1 hour (or up to 24 hours). This rest helps the dough relax and become easier to roll.
Step 2: Roll out and line the tart pan
Remove the chilled dough from the refrigerator and let it rest at room temperature for 5–10 minutes until just pliable. Lightly flour your work surface and rolling pin. Roll the dough into a circle about 28–30 cm (11–12 inches) in diameter and about 3 mm (1/8 inch) thick, rotating and lightly flouring as needed to prevent sticking.
Carefully roll the dough around your rolling pin and unroll it over a 23 cm (9-inch) fluted tart pan with a removable bottom. Gently press the dough into the bottom and up the sides without stretching it. Use a small piece of extra dough as a “cushion” to press into the corners if needed. Trim excess dough by rolling the pin over the top edge or using a sharp knife.
Prick the base of the tart shell all over with a fork (this helps prevent bubbles). Place the lined tart pan in the freezer or refrigerator for 15–20 minutes while you preheat the oven to 180°C / 350°F. Chilling again helps the crust keep its shape.
Step 3: Blind-bake and seal the crust
Cut a piece of baking parchment slightly larger than the tart and press it into the chilled shell. Fill with baking beans, dried rice, or sugar to weigh it down. Place the tart pan on a baking sheet for easier handling.
Blind-bake in the preheated oven for 15 minutes. Carefully lift out the parchment and weights. The crust will look pale and slightly set. Brush the base and sides lightly with the beaten egg white; this creates a thin seal that keeps the crust crisp beneath the caramel filling.
Return the tart shell to the oven (without weights) and bake for another 5–7 minutes, until the base is just lightly golden. Remove from the oven and set on a cooling rack. Reduce oven temperature to 160°C / 320°F to toast the walnuts in the next step.
Step 4: Toast and prep the walnuts
Spread the walnut halves in a single layer on a baking sheet. Toast in the 160°C / 320°F oven for 8–10 minutes, stirring once, until they smell fragrant and are lightly golden. Watch carefully toward the end, as nuts can go from toasted to burned quickly.
Remove the walnuts from the oven and let them cool slightly, then roughly chop them so you have a mix of pieces and a few larger chunks. This gives the tart a lovely rustic texture. Set aside. Increase the oven temperature back to 180°C / 350°F in preparation for baking the filled tart.
Step 5: Make the walnut caramel
Before you start, make sure your butter is at room temperature and your cream is warm or at least not fridge-cold to minimize splattering. In a medium, heavy-bottomed saucepan, combine the granulated sugar and water. Stir gently just to moisten the sugar, then place over medium heat.
Cook without stirring until the syrup turns a deep amber color, 8–12 minutes depending on your heat and pan. You can gently swirl the pan occasionally to even out the color, but do not stir, or the sugar may crystallize. Keep a close eye; caramel darkens quickly in the last minute.
Once the syrup reaches a deep amber (like dark honey but not yet brown-black), remove from the heat. Carefully and slowly pour in the cream while whisking constantly; the mixture will bubble up vigorously. Add the butter pieces, honey, vanilla, and salt, whisking until smooth and glossy. If using, stir in the walnut liqueur or rum off the heat. If any lumps remain, return to low heat and whisk until smooth.
Step 6: Fold in walnuts and fill the tart
Stir the chopped toasted walnuts into the warm caramel until they are thoroughly coated and evenly distributed. The mixture will be thick and generously packed with nuts, which is exactly what you want; the walnuts are the star.
Place the pre-baked tart shell (still in its pan) on a baking sheet. Pour the walnut-caramel mixture into the shell, using a spatula to scrape every last bit from the saucepan. Spread the filling into an even layer, nudging nuts into any gaps so the surface is evenly packed.
Bake the filled tart at 180°C / 350°F for 10–12 minutes, until the caramel is bubbling gently around the edges and looks slightly thickened. It will continue to set as it cools, so avoid overbaking or the caramel may become too firm.
Step 7: Cool, slice, and serve
Remove the tart from the oven and place on a wire rack. Allow it to cool in the pan until it reaches room temperature, at least 2 hours. The caramel needs this time to firm up properly so you get clean slices.
Once cool, carefully remove the outer ring of the tart pan. Slide the tart onto a serving plate if desired. For neater slices, use a sharp, thin knife wiped clean between cuts. This tart is delicious served plain, with a dollop of lightly sweetened whipped cream, or alongside a scoop of vanilla ice cream or crème fraîche to balance the richness.
Enjoy your Grenoble walnut tart at room temperature, where the caramel is soft, glossy, and the walnut flavor is at its best.
Pro Tips
- Watch the caramel like a hawk: Once it starts to color, it can go from perfect to burnt in under a minute. Aim for a deep amber rather than dark brown.
- Room-temperature cream and butter: Cold dairy will cause the caramel to seize and splatter more. Slightly warm cream makes for a smoother, safer finish.
- Do not skimp on chilling the dough: A well-chilled tart shell shrinks less, bakes more evenly, and keeps its pretty fluted edges.
- Use good walnuts: Fresh, high-quality walnuts (ideally Grenoble AOP if available) make a big difference, as stale nuts can taste bitter and ruin the tart.
- Adjust the salt to taste: A touch more salt can beautifully sharpen the flavors and cut the sweetness of the caramel.
Variations
- Mixed nut tart: Replace up to half of the walnuts with toasted hazelnuts or pecans for a more complex nut flavor while keeping the same caramel base.
- Chocolate-lined crust: After blind-baking, brush the cooled crust with a thin layer of melted dark chocolate and let it set before adding the filling, for a subtle chocolate note and extra crispness.
- Orange and walnut: Add 1 tsp finely grated orange zest to the caramel off the heat and garnish the cooled tart with a few thin orange zest strips for a bright citrus aroma.
Storage & Make-Ahead
This Grenoble walnut tart keeps very well and is an excellent make-ahead dessert. Once completely cooled, cover loosely with foil or place in a cake box and store at room temperature for up to 2 days. For longer storage, refrigerate for up to 4–5 days; bring back to room temperature for 30–45 minutes before serving so the caramel softens.
You can also freeze the fully cooled tart, well-wrapped, for up to 1 month. Thaw overnight in the refrigerator and then bring to room temperature. The tart crust dough itself can be made up to 2 days in advance and kept chilled, or frozen (well-wrapped) for up to 1 month; thaw overnight in the fridge before rolling. The tart shell can be blind-baked a day ahead, cooled, and stored at room temperature in an airtight container until you are ready to make the filling.
Nutrition (per serving)
Approximate values for 1 of 8 slices: 520 kcal; 38 g fat; 16 g saturated fat; 45 g carbohydrates; 27 g sugar; 3 g protein; 2 g fiber; 200 mg sodium. These values are estimates and will vary based on exact ingredients and portion sizes.
