French Onion Steak & Mushroom Tart (6 Or More)

Sherry M Watson
Ratings : 4.0 ⭐ from 349
⌛ About 30 minutes
🗒️ 13 ingredients
👩‍🍳 6 or more

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Today's feature is the french onion steak & mushroom tart. This enjoyable recipe is straightforward and quick to prepare.

All you need are 13 ingredients and the willingness to follow 10 easy steps.

French Onion Steak & Mushroom Tart (6 Or More)

Ingredients

  • 4 T. Butter, divided
  • 2 medium onions, halved and sliced thin
  • Salt & pepper
  • 1/4 cup Sherry
  • 1/4 cup hot water
  • 1 tsp. Better Than Bouillon beef concentrate
  • 12 oz. Mushrooms, sliced or diced
  • 2-3 Garlic cloves, minced
  • 1 T. Fresh thyme leaves
  • 3/4 lb. Ribeye steak (or more), thinly sliced
  • 1-1/4 c. Gruyere cheese, shredded
  • 1 lg. Puff pastry sheet (I pieced together both that came in the pkg.)
  • 1 egg, beaten (for egg wash)
⚡Before proceeding to the steps of creating "French Onion Steak & Mushroom Tart (6 Or More)", it is advisable to explore the following brief health tips:
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We trust that you’ve gained some valuable insights from this information. Now, let’s return to the preparation of the "french onion steak & mushroom tart".

💡️ Once all the ingredients are ready, you are ready to concoct french onion steak & mushroom tart by following the 10 following instructions:

Method

  • Melt 2 T. butter in large skillet over medium heat. Stir in onions. As soon as you start to see a little browning, reduce heat to low. Add salt & pepper. Cook, stirring occasionally, until caramelized. This takes 40-45 minutes. Don't try to rush it!! It's a low-and-slow process! Dissolve the Better Than Bouillon in the hot water.

    French Onion Steak & Mushroom Tart (6 Or More)French Onion Steak & Mushroom Tart (6 Or More)French Onion Steak & Mushroom Tart (6 Or More)

  • While the onions are cooking, slice the mushrooms, strip the thyme leaves from the stems, and mince the garlic. Frequently check and stir the onions.

    French Onion Steak & Mushroom Tart (6 Or More)French Onion Steak & Mushroom Tart (6 Or More)French Onion Steak & Mushroom Tart (6 Or More)

  • When the onions have beautifully caramelized, stir in the sherry. Cook for 1 minute and add the beef broth. Stir and cook another 2 minutes to slightly reduce the liquid. Remove from skillet into a bowl and set aside to cool.

    French Onion Steak & Mushroom Tart (6 Or More)French Onion Steak & Mushroom Tart (6 Or More)French Onion Steak & Mushroom Tart (6 Or More)

  • Add 2 T. butter to the skillet. Stir in the mushrooms, salt and pepper, and cook over medium-high heat, stirring frequently, for 5-8 minutes. Grate the cheese.

    French Onion Steak & Mushroom Tart (6 Or More)French Onion Steak & Mushroom Tart (6 Or More)

  • When mushrooms have browned, stir in the garlic and thyme and cook until fragrant, about 2 minutes. I know they're ready when my sister yells from the other room, "OMG! what smells so good?!!" 😉😋 Remove from the skillet and stir them into the bowl of cooling onions. I put the bowl in the fridge because I do all this prep early in the day then make the tart in the evening.

    French Onion Steak & Mushroom Tart (6 Or More)French Onion Steak & Mushroom Tart (6 Or More)French Onion Steak & Mushroom Tart (6 Or More)

  • Thinly slice the steak. You can remove/discard the fat if you like, but we love the flavor of ribeye fat, so I leave some.

    French Onion Steak & Mushroom Tart (6 Or More)

  • Preheat oven to 400°F. Place a piece of parchment paper the size of your baking sheet on your work surface, and sprinkle lightly with flour. Place the thawed puff pastry sheet on the parchment, and gently roll with a rolling pin, just enough to even the edges and make it symmetrical to fit your baking sheet. (I pieced 2 sheets together)

    French Onion Steak & Mushroom Tart (6 Or More)

  • With a sharp knife, gently score the pastry about 1/2 inch from the edge, all the way around, taking care not to cut all the way through the pastry. Use a fork to prick the center of the puff pastry a few times (not the border) to help it bake flat. (Place the pastry into the fridge to chill for a few minutes if it is becoming warm.) Egg wash the 1/2 inch border of the tart.

    French Onion Steak & Mushroom Tart (6 Or More)French Onion Steak & Mushroom Tart (6 Or More)

  • Sprinkle 3/4 cup of the cheese on the bottom, then top with the mushrooms and caramelized onions. Top with the steak slices, trying to distribute evenly. Sprinkle over this another 1/2 cup of cheese.

    French Onion Steak & Mushroom Tart (6 Or More)French Onion Steak & Mushroom Tart (6 Or More)French Onion Steak & Mushroom Tart (6 Or More)

  • Bake for 25 to 30 minutes (mine took about 28 minutes), or until a deep, golden brown. Allow to cool on the baking sheet for 10 minutes, then sprinkle over the remaining thyme leaves as garnish. Cut the tart into pieces. Serve hot, or at room temp.

    French Onion Steak & Mushroom Tart (6 Or More)French Onion Steak & Mushroom Tart (6 Or More)

We're confident that by accurately following the recipe we've provided, from the ingredients to the steps, you'll achieve excellent results.

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