Caramelized Onion Bacon Quiche

There is something deeply comforting about a well-made quiche. This Caramelized Onion and Bacon Quiche brings together the slow-cooked sweetness of golden onions, the smoky depth of crisped bacon, and a silky custard cradled in a flaky shortcrust pastry. It is a dish rooted in French tradition — the kind that fills a kitchen with warmth and draws people to the table before it is even finished baking. Whether you are hosting a leisurely weekend brunch or sitting down to a light weeknight dinner, this quiche delivers elegance without demanding too much effort.

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The heart of this quiche is patience. The onions need a full 25 to 30 minutes over gentle heat to transform from sharp and pungent into something deeply golden and almost jamlike. It is that slow caramelization — coaxed along with a touch of sugar, butter, and olive oil — that gives this quiche its soul. The smoky bacon adds contrast and body, while the custard of eggs, cream, and whole milk binds everything together with a tender, yielding texture. A generous handful of grated Gruyère melted over the top finishes the picture beautifully.

Ingredients

• Pastry
• 1 sheet (about 250 g) store-bought or homemade shortcrust pastry
• Filling
• 200 g smoked bacon, diced
• 3 large yellow onions, thinly sliced
• 2 tbsp unsalted butter
• 1 tbsp olive oil
• 1 tsp sugar
• 1/2 tsp salt
• 1/4 tsp black pepper
• 1/4 tsp dried thyme (optional)
• Custard
• 3 large eggs
• 200 ml heavy cream
• 100 ml whole milk
• 1/4 tsp ground nutmeg
• 80 g grated Gruyère or Swiss cheese
• Additional salt and pepper, to taste

Instructions

Step 1 — Preheat the oven

Preheat oven to 180°C (350°F).

Step 2 — Prepare the pastry shell

Roll out the pastry and line a 23 cm (9-inch) tart pan. Trim excess and prick the base with a fork. Chill while preparing the filling.

Step 3 — Cook the bacon

In a large skillet over medium heat, cook the bacon until crisp. Remove with a slotted spoon, drain on paper towels, and set aside.

Step 4 — Caramelize the onions

Discard excess bacon fat, leaving about 1 tablespoon. Add butter and olive oil to the pan. Add onions, sugar, salt, and thyme. Cook over medium-low heat, stirring occasionally, for 25–30 minutes until onions are deeply golden and caramelized. Remove from heat and let cool slightly.

Step 5 — Make the custard

In a bowl, whisk together eggs, cream, milk, nutmeg, and a little salt and pepper.

Step 6 — Assemble the quiche

Scatter the caramelized onions and bacon evenly over the chilled pastry base. Sprinkle with grated Gruyère.

Step 7 — Add the custard

Pour the custard mixture gently over the filling.

Step 8 — Bake

Bake for 35–40 minutes, or until the quiche is set and lightly golden. Let cool 10 minutes before slicing.

Step 9 — Serve

Serve warm or at room temperature.

Zusatztipps für die Zubereitung

Damit die Quiche gelingt, sollte der Teigboden gut gekühlt in die Form gegeben und vor dem Belegen im Kühlschrank geruht haben — so zieht er sich beim Backen nicht zusammen. Die Zwiebeln brauchen wirklich Zeit: Wer die Hitze zu hoch aufdreht, riskiert angebrannte statt karamellisierter Zwiebeln. Ein Deckel in den ersten Minuten kann helfen, die Feuchtigkeit zu halten, bevor sie langsam verdampft. Der Guss sollte erst kurz vor dem Backen auf die Füllung gegossen werden, damit der Boden nicht aufweicht. Nach dem Backen unbedingt 10 Minuten ruhen lassen, damit der Guss fest wird und sich die Quiche sauber aufschneiden lässt.

Varianten und Anpassungen

Der Gruyère lässt sich problemlos durch Emmentaler oder Cheddar ersetzen, wenn er nicht zur Hand ist. Wer eine vegetarische Version bevorzugt, lässt den Speck einfach weg und ersetzt ihn durch sautierte Champignons oder andere Pilze. Der getrocknete Thymian ist optional, gibt dem Gericht aber eine feine Kräuternote, die sehr gut zu den Zwiebeln passt. Für eine reichhaltigere Variante kann die Milch vollständig durch Sahne ersetzt werden.

Serviervorschläge

Die Quiche schmeckt warm direkt aus dem Ofen genauso gut wie bei Zimmertemperatur — ideal also für ein entspanntes Brunch-Buffet. Besonders schön passt dazu ein knackiger grüner Salat mit einem leichten Essig-Öl-Dressing sowie ein gut gekühlter Chardonnay, dessen Säure wunderbar mit dem cremigen Guss und dem karamellisierten Zwiebelgeschmack harmoniert.

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This Caramelized Onion and Bacon Quiche is one of those recipes that rewards patience with flavor. Every step — from the slow golden transformation of the onions to the gentle set of the custard in the oven — builds toward something far greater than the sum of its parts. It is a dish to share, to linger over, and to return to again and again. Serve it at your next brunch, bring it to a gathering, or simply enjoy a quiet slice at your kitchen table. However you choose to eat it, this quiche is certain to become a favorite.

Recipe FAQs

→ How do I caramelize onions perfectly for this tart?

Cook sliced onions slowly in butter and olive oil over medium-low heat, stirring occasionally for 25–30 minutes until they turn deeply golden and sweet.

→ Can I use store-bought pastry for convenience?

Yes, store-bought shortcrust pastry works well and saves preparation time while providing a crisp, flaky base.

→ What cheese pairs best with this dish?

Gruyère is traditional, but Emmental or sharp cheddar can be substituted to add creaminess and depth.

→ How can I make a vegetarian version of this tart?

Simply omit the bacon and replace it with sautéed mushrooms to maintain a savory, hearty filling.

→ When is this tart best served?

Serve warm or at room temperature, ideal for brunch, lunch, or a light evening meal, often paired with a crisp salad.

→ How do I ensure the filling sets properly?

Bake the filled tart at moderate oven heat for 35–40 minutes until the custard is just set and the top is lightly golden.