Miso-Caramelized Onion and Mushroom Tart
A savory tart with a buttery crust, filled with sweet caramelized onions and mushrooms in a miso glaze, ideal for a light lunch or appetizer. This french-inspired vegetarian ready in about 85 minutes layers all-purpose flour, unsalted butter, ice water 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 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
- 1 cup all-purpose flour
- 1/2 cup, cold, cubed unsalted butter
- 1/4 cup ice water
- 1/4 tsp salt
- 2 tbsp olive oil
- 1 large, thinly sliced yellow onion
- 1 cup, sliced cremini mushrooms
- 2 tbsp white miso paste
- 1 tbsp rice vinegar
- 1 tbsp honey
- 1/4 cup, chopped fresh parsley
- 1/4 cup, grated Gruyère cheese
Equipment for this recipe
Top-rated tools to make this recipe successfully.
Instructions
- Step 1: Whisk together 1 cup all-purpose flour, 1/4 tsp salt, and 1/2 cup cold unsalted butter (cubed) in a food processor until mixture resembles coarse sand. Add 1/4 cup ice water and pulse until dough comes together. Form into a disk, wrap in plastic, and refrigerate for 30 minutes.
- Step 2: Preheat oven to 375°F (190°C). Roll out chilled dough on a floured surface to fit a 9-inch tart pan. Press into pan and trim edges.
- Step 3: Heat 2 tbsp olive oil in a skillet over medium heat. Add 1 large yellow onion (thinly sliced) and cook for 20-25 minutes, stirring occasionally, until deeply golden and caramelized. Add 1 cup cremini mushrooms (sliced) and cook for 5 more minutes until tender.
- Step 4: Whisk together 2 tbsp white miso paste, 1 tbsp rice vinegar, and 1 tbsp honey. Stir into onion-mushroom mixture until combined. Remove from heat and stir in 1/4 cup fresh parsley.
- Step 5: Spread onion-mushroom mixture evenly into tart crust. Sprinkle 1/4 cup grated Gruyère cheese on top.
- Step 6: Bake at 375°F (190°C) for 30-35 minutes until crust is golden and filling is bubbling. Let cool 10 minutes before slicing.
Frequently asked questions
How long does Miso-Caramelized Onion and Mushroom Tart take to make?
Total time is about 85 minutes (45 min prep + 40 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 Miso-Caramelized Onion and Mushroom 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 Miso-Caramelized Onion and Mushroom 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 Miso-Caramelized Onion and Mushroom 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.
What goes well with Miso-Caramelized Onion and Mushroom Tart?
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
- ★★★★★
Kids gobbled it up without complaints — that's a 5-star in my book.
- ★★★★★
Great base recipe! I added a pinch of smoked paprika and it was even better.
- ★★★★☆
My family liked it. I personally would prefer more depth of flavor.
