Vintage Caramelized Onion Tart with Rosemary
A nostalgic French-inspired tart featuring deeply caramelized onions and flaky puff pastry, inspired by the 'authentic' historical craftsmanship of Martin guitars. This french-inspired vegetarian ready in about 55 minutes layers puff pastry, yellow onion, unsalted butter into a dessert worth slowing down for — great for weekend baking, holiday tables, or any time you want a sweet payoff at the end of a meal. Each serving lands at about 280 calories and feeds 6, so it slots into a weekend bake or a special-occasion dessert tray. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.
Ingredients
- 300g puff pastry
- 300g yellow onion
- 2 tbsp unsalted butter
- 1 tbsp fresh rosemary
- 1 tsp coarsely ground black pepper
- 50ml heavy cream
- 1 tsp kosher salt
Instructions
- Step 1: Preheat oven to 200°C (390°F). Roll out puff pastry on a floured surface to 4mm thickness, then transfer to a parchment-lined baking sheet.
- Step 2: Thinly slice 300g yellow onions into half-moons, then melt 2 tbsp butter in a large skillet over medium heat. Add onions and 1 tsp salt, stirring occasionally until golden brown and caramelized, about 25 minutes.
- Step 3: Stir 1 tbsp fresh rosemary into the onions, then add 50ml heavy cream and simmer for 3 minutes until the sauce thickens and coats the back of a spoon.
- Step 4: Spread onion mixture evenly over the puff pastry, leaving a 1cm border. Sprinkle with 1 tsp coarsely ground black pepper.
- Step 5: Bake for 20-25 minutes until the pastry is golden brown and the edges are crisp, rotating halfway through.
Equipment for this recipe
Top-rated tools to make this recipe successfully.
Frequently asked questions
How long does Vintage Caramelized Onion Tart with Rosemary take to make?
Total time is about 55 minutes (30 min prep + 25 min cook). Most home bakers find this fits a weekend afternoon; chill or store as the recipe directs before serving.
How do I store leftover Vintage Caramelized Onion Tart with Rosemary?
Cool fully before storing. Most baked desserts keep at room temperature in an airtight container for 2–3 days, or in the fridge for up to 5 days. Cream- or custard-based desserts must go in the fridge within 2 hours; reheat gently or serve cold per the recipe.
Can I substitute ingredients in Vintage Caramelized Onion Tart with Rosemary?
Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.
How do I scale Vintage Caramelized Onion Tart with Rosemary for a different number of people?
The recipe is written for 6 servings. Multiply each ingredient by (your serving target / 6). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.
What goes well with Vintage Caramelized Onion Tart with Rosemary?
French vegetarian like this pair well with a simple grain (rice, couscous, or crusty bread), a quick salad with acid (lemon vinaigrette, pickled onions), and a pan sauce or yogurt-based dip. Tap "Plan a meal with the AI" to get specific side suggestions.
What others are saying
- ★★★★★
Used frozen vegetables instead of fresh and honestly couldn't tell the difference.
- ★★★★☆
Really good but took about 10 minutes longer than stated.
- ★★★★☆
Solid recipe. Not groundbreaking but definitely making it again.
