Vintage Martin Guitar-Inspired Caramelized Onion Tart
A rustic tart featuring layers of golden caramelized onions and nutty cheese, inspired by Martin's authentic vintage guitar craftsmanship and rich history. This mediterranean-inspired one pot (vegetarian) ready in about 88 minutes layers large, thinly sliced yellow onions, extra virgin olive oil, 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 385 calories and feeds 8, 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
- 4 large, thinly sliced yellow onions
- 3 tbsp extra virgin olive oil
- 2 tbsp butter
- 1 cup all-purpose flour
- 1/2 cup, cubed cold unsalted butter
- 1/4 cup ice water
- 1 cup shredded Gruyère cheese
- 2 tbsp fresh thyme leaves
- 1/2 tsp sea salt
- 1/4 tsp black pepper
Instructions
- Step 1: Preheat oven to 375°F. In a large skillet over medium-low heat, melt 1 tbsp butter and 1 tbsp olive oil, then add all sliced onions and 1/4 tsp salt. Cook uncovered for 45-50 minutes, stirring occasionally, until deeply golden and caramelized — do not rush this step to achieve authentic sweetness.
- Step 2: Meanwhile, make the crust: In a food processor, pulse 1 cup flour and 1/2 tsp salt. Add cubed cold butter and pulse until pea-sized crumbs form. Gradually add ice water while pulsing, until dough just holds together. Press into a 9-inch tart pan and chill for 30 minutes.
- Step 3: After caramelization, mix 1/4 cup of the onion liquid with Gruyère, thyme, and black pepper. Spread evenly over the chilled tart crust. Arrange caramelized onions in concentric circles on top. Bake for 25-28 minutes until crust is golden and filling is bubbling at edges.
Equipment for this recipe
Top-rated tools to make this recipe successfully.
Frequently asked questions
How long does Vintage Martin Guitar-Inspired Caramelized Onion Tart take to make?
Total time is about 88 minutes (60 min prep + 28 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 Martin Guitar-Inspired Caramelized Onion Tart?
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 Martin Guitar-Inspired Caramelized Onion Tart?
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 Martin Guitar-Inspired Caramelized Onion Tart for a different number of people?
The recipe is written for 8 servings. Multiply each ingredient by (your serving target / 8). 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.
Is Vintage Martin Guitar-Inspired Caramelized Onion Tart vegetarian?
Yes — this recipe is tagged vegetarian based on its ingredient list. Always cross-check labels for packaged ingredients (sauces, broths, condiments) since formulations vary by brand.
What others are saying
- ★★★★☆
Nice recipe! Presentation was beautiful. Flavor was good, not great.
- ★★★★☆
My family liked it. I personally would prefer more depth of flavor.
- ★★★☆☆
Decent recipe but nothing special. Might try a different version.
