Rustic Onion Tart
Simply Recipes
ingredients
- 1 Pâte Brisée (tart dough) for one 10-inch tart (see method for making pâte brisée) or 1 packaged, flat pie crust (Trader Joe’s has one in their frozen section)
- 3 medium sized red onions
- 2 Tbsp olive oil
- 1 Tbsp butter
- Salt
- 1 teaspoon balsamic vinegar
- 3/4 cup (not packed) roughly grated Gruyre Swiss cheese


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