Emmentaler Cheese Tart with Caramelized Onions & Mushrooms

This week, stop into Oliver’s and bring home a slice of Götthelf’s AOP Slow Food Emmentaler Cheese ($19.99/lb)! An incredibly special cheese, Götthelf Emmentaler is the only certified Slow Food Emmentaler in the world. Only 2 wheels are handmade each day by this husband and wife duo at their dairy and home high in the Swiss Alps. Use it to top crispy puff pastry in this incredible, savory tart! With the nutty Emmentaler, sweet caramelized onions, and deeply earthy mushrooms, it’s a great way to start any meal or makes a truly decadent lunch.

*Cheese price good through 11/3/20.

  • Serves: 8-12 servings
  • Prep Time: 15 minutes
  • Cook Time: 20 minutes


  • 1 sheet Frozen Puff Pastry, thawed but kept very cold
  • 2 c. Emmentaler Cheese, shredded
  • 1 large Red Onion, thinly sliced
  • 1 1/2 c. Crimini Mushrooms, thinly sliced
  • 2 tsp. Thyme, chopped
  • 2 tsp. Rosemary, chopped
  • 2 tbsp. Olive Oil + extra for drizzling
  • 1 tbsp. Butter
  • 1/4 c. Dry White Wine
  • Salt & Black Pepper


  1. Preheat oven to 400 degrees, and prepare a large sheet pan with parchment paper. Preheat a large skillet on medium until hot, then add olive oil. When oil is hot, add sliced red onion and season lightly with salt. Allow onions to caramelize for 5 to 7 minutes, then add mushrooms, garlic, and chopped herbs. When garlic is fragrant, raise heat to high and stir in wine.

  2. Reduce wine until essentially gone, then stir in butter. Season to taste with salt and pepper, then remove from heat and cool completely. Roll out puff pastry to a 9x13 inch rectangle and lay on prepared baking sheet. Poke all over with a fork, leaving a 1 inch border, then drizzle with olive oil. Cover evenly with shredded Emmentaler cheese, then top with onions and mushrooms. Bake for 20 minutes or until cheese is melted and pastry is crisp. Allow tart to rest for 5 minutes before serving.

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