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Why This Recipe Works

Blitz-and-press crust: Toasted hazelnuts are blitzed with flour, cocoa, and brown sugar for a press-in crust that tastes like Nutella in pastry form—no rolling pin required.
Two-chocolate filling: A 70 % cacao bittersweet base plus a touch of milk chocolate gives depth without palate fatigue.
Cream-to-egg ratio: Heavy cream and whole eggs are balanced so the tart sets sliceably creamy, never rubbery.
Frangipane insurance: A whisper of hazelnut praline paste in the filling guarantees that haunting gianduja flavor even if your chocolate isn’t top-shelf.
Make-ahead magic: The crust can be pressed and frozen up to a month; the finished tart keeps 3 days refrigerated or 2 weeks frozen, so you can host without last-minute panic.
Gluten-free friendly: Swap in cup4cup and the texture stays silky—no one notices.

Ingredients You'll Need

Great chocolate desserts start with great chocolate, but every component here pulls its weight. Let’s break it down:

Hazelnuts: Look for whole, skin-on nuts in the bulk bin; they stay fresher longer. If you can only find pre-blanched, toast them anyway—five minutes at 350 °F awakens the oils and intensifies flavor.
Cocoa powder: Dutch-processed keeps the crust dark and mellow. Natural works, but the color will be reddish and the flavor slightly sharper.
Butter: European-style (82 % fat) gives the crust flake and the filling gloss. If you’re dairy-free, refined coconut oil subs 1:1 in the crust, but expect a whisper of coconut.
Chocolate: Buy bars, not chips. Chips contain stabilizers that resist melting smoothly. My weeknight favorite is Ghirardelli 70 %; for show-off dinners I splurge on Valrhona Manjari.
Hazelnut praline paste: Sold in specialty food shops or online. If you can’t find it, pulse ½ cup caramelized hazelnuts (or even Nutella) in a food processor until buttery and use ¼ cup of that.
Heavy cream: Ultra-pasteurized is fine here because we’re boiling it. For a silkier mouthfeel, use 50 % heavy cream and 50 % crème fraîche.
Eggs: Room-temperature eggs incorporate without seizing the chocolate. Place cold eggs in a bowl of hot tap water for five minutes while you prep.
Sea salt: A flaky finish on top (I love Maldon) cuts through richness and makes the chocolate sing.

How to Make Rich Chocolate Hazelnut Tart for Dinner Parties

Toast & Skin the Hazelnuts

Preheat oven to 350 °F (177 °C). Scatter 1 cup (130 g) hazelnuts on a sheet pan and roast 8–10 min, until skins blister and the kitchen smells like roasted ice-cream cones. Tip hot nuts onto a clean kitchen towel, fold the towel over, and rub vigorously; most skins will flake off. Don’t obsess—tiny flecks add speckled charm. Cool completely.

Blitz the Press-In Crust

In a food processor pulse cooled hazelnuts until coarse meal. Add 1 cup (125 g) all-purpose flour, ¼ cup (25 g) Dutch cocoa, ⅓ cup (70 g) packed brown sugar, ¼ tsp espresso powder, and ½ tsp kosher salt. Pulse to combine. Drizzle in ½ cup (113 g) melted unsalted butter and 1 Tbsp cold water; pulse until the mixture looks like wet sand and clumps when squeezed. Tip into a 9-inch (23 cm) loose-bottom tart pan. Press evenly up the sides first, then across the base—thickness should be about 3 mm. Freeze 15 min to firm.

Blind Bake

Line frozen crust with crinkled parchment and fill with pie weights or dried beans. Bake 18 min, remove weights, then bake 5 min more. The crust should look matte and smell nutty. Cool on a rack; leave oven on.

Warm the Cream

In a small saucepan combine 1 cup (240 ml) heavy cream, 2 Tbsp hazelnut praline paste, and 2 Tbsp granulated sugar. Bring just to a bare simmer (small bubbles at edge). Remove from heat; stir to dissolve praline.

Melt the Chocolate

Place 6 oz (170 g) chopped bittersweet chocolate and 2 oz (55 g) chopped milk chocolate in a heat-proof bowl. Pour hot cream mixture over chocolate; let stand 1 min, then whisk from center outward until glossy and smooth.

Temper in the Eggs

Whisk 2 large room-temperature eggs with 1 tsp vanilla and ¼ tsp kosher salt. Slowly drizzle warm chocolate mixture into eggs, whisking constantly (this prevents scrambled bits). Strain back into bowl to catch any rogue flecks.

Fill & Second Bake

Place tart pan on a sheet pan to catch drips. Pour filling into cooled crust to within 3 mm of rim. Bake 14–16 min, until the outer inch is set but the center jiggles like Jell-O when nudged. Over-baking equals cracked surface; err on the side of wobble.

Chill & Glaze

Cool tart on rack 30 min, then refrigerate at least 3 hours (overnight is ideal). Just before serving, warm ¼ cup (60 ml) heavy cream to steaming, pour over 2 oz (55 g) chopped bittersweet chocolate, wait 30 s, whisk until smooth. Pour glaze into center and tilt to create a mirror finish. Sprinkle with 2 Tbsp chopped toasted hazelnuts and a snow of flaky salt.

Expert Tips

Temperature is everything

If your kitchen is warmer than 74 °F, chill the crust for 30 min after pressing and before blind-baking to prevent slumping.

Prevent cracks

Bake until the center registers 165 °F on an instant-read thermometer; above 170 °F the custard will weep and crack as it cools.

Transport tips

Set the tart (still on its metal base) inside a clean 10-inch cake pan; the rim protects the glossy surface from plastic wrap or rogue thumbs.

Slice like a pro

Heat a long chef’s knife under hot water, wipe dry, slice in one confident press. Wipe and reheat between cuts for showroom edges.

Overnight flavor

The hazelnut notes bloom after 24 hours, making this tart an ideal make-ahead for busy entertainers.

Mirror glaze rescue

If your ganache splits, whisk in 1 tsp warm cream and ½ tsp corn syrup; it will reunite into silky perfection.

Variations to Try

Orange Hazelnut: Add 1 Tbsp Grand Marnier and ½ tsp finely grated orange zest to the warm cream; garnish with candied peel.
Espresso Mocha: Increase espresso powder to 1 Tbsp and replace 2 Tbsp cream with strong cooled espresso.
Black Forest: Fold ⅓ cup chopped dried cherries into the filling; garnish with fresh cherries and shaved chocolate curls.
Vegan Silken: Substitute coconut cream for dairy cream, ½ cup silken tofu for eggs, and use 72 % vegan chocolate. Bake 18 min; chill overnight to set.
Almond Hazelnut: Replace ½ cup hazelnuts with toasted almonds for a milder, marzipan-like nuance.
Spiced Mexican: Whisk ¼ tsp cinnamon and a pinch of cayenne into the chocolate mixture; top with cinnamon-dusted whipped cream.

Storage Tips

Refrigerator: Once fully chilled, tent tart with foil or place in an airtight cake carrier. It will keep 3 days without drying; beyond that the crust begins to stale. Let slices stand at room temp 15 minutes before serving to take the chill off the chocolate.

Freezer: After the glaze sets, slip the tart (still on metal base) into a gallon freezer bag; expel air, seal, and freeze up to 2 weeks. Thaw 6 hours in the refrigerator, then 30 minutes on counter before glazing again if needed.

Make-ahead components: The toasted hazelnuts keep 1 month in an airtight jar at room temp. The blind-baked crust can be wrapped and frozen up to 1 month; fill directly from frozen—no need to thaw. The ganache glaze can be made 3 days ahead; rewarm gently to fluidity before pouring.

Frequently Asked Questions

You can, but you’ll lose the hazelnut magic. If time is short, pulse ½ cup hazelnuts into store-bought chocolate cookie crumbs and bind with butter per the recipe; press into the pan and proceed.

Tap the bowl firmly on the counter to pop bubbles, then pass the ganache through a fine sieve before pouring. Pour from the center outward in a steady stream; resist the urge to spread with a spatula.

Absolutely—halve every ingredient and bake 11–13 min. The final height will be slightly taller, but the bake time shortens because the filling mass is smaller.

Replace hazelnuts with toasted pumpkin seeds (pepitas) in the crust and omit praline paste. The flavor will be earthier; add ½ tsp more vanilla to round it out.

Freeze the finished tart solid, then nestle it (on its base) into a small cooler with two frozen gel packs. It will be perfectly thawed by dessert time and you’ll never worry about sliding glaze.

A late-bottle vintage Port or a Tawny 10-year mirrors the nuttiness. If you prefer red, an off-dry sparkling Shiraz lifts the chocolate without cloying sweetness.

Rich Chocolate Hazelnut Tart for Dinner Parties

Why This Recipe Works

Ingredients You'll Need