Roast Beef, Caramelized Onion + Gruyere Panini

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Roast Beef, Caramelized Onion + Gruyere Panini 5

I’m only one post into Cookie Week but let’s take a quick break to talk about this sandwich, which was inspired by the flavors of French onion soup. Yup, that’s right: rare roast beef, soft, caramelized onions, and gooey gruyere cheese all tucked between two pieces of crisp bread. I could eat the panini every day of the week and be a happy camper; Shawn said it’s “even better than a burger.” Served on the side of some potato-leek soup, it was just about perfect.

When trying to come up with some unique ways to use Pillsbury Refrigerated Pizza Dough, I came up with the idea of using it as bread for sandwiches. There are only two of us in the house and we’re generally not big sandwich eaters, so I rarely by bread – we just don’t eat it fast enough and I don’t like the way it tastes after its been refrigerated or frozen.  It turns out that pizza dough – especially the artisan variety made with whole grains – was the perfect solution to my bread problem. It keeps in the refrigerator for a long time and bakes up quickly wen you need it, and one tube makes the perfect amount (and we each get a leftover sandwich for lunch the next day!)

I discovered that Pillsbury already has a few recipes on their site that uses the dough this way, so the idea wasn’t as creative as I thought it was, but it’s still a great tip and a method that I’ll be using again!

Roast Beef, Caramelized Onion + Gruyere Panini 6


Roast Beef, Caramelized Onion + Gruyere Panini 7

Roast Beef, Caramelized Onion + Gruyere Panini

The roast beef will cook slightly as the sandwiches toast, so ask for the rarest roast beef that the deli has. Save time and help get dinner on the table quickly by caramelizing the onions while you wait for the oven to heat and the bread to bake.
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Cook Time: 30 minutes
Total Time: 30 minutes
Servings: 4
Author: Lauren Keating


  • 1 can 13.8 ounces Pillsbury Refrigerated Artisan Pizza Crust with Whole Grain
  • 1 teaspoon Butter
  • 1 Sweet Onion such as Vidalia, thinly sliced
  • 2 tablespoons Mustard
  • 1 pound cooked Roast Beef from deli, thinly sliced
  • 1 cup Arugula
  • pound Gruyere Cheese


  • Heat oven to 375. Spray large cookie sheet with cooking spray. Unroll dough onto sheet and press into 16x11 inch rectangle. Bake 9 to 16 minutes, or until slightly puffed and cooked through; remove from oven. Use sharp knife to cut crust in half lengthwise and crosswise to make 4 rectangles. Cut each rectangle in half crosswise for a total of 8 squares.
  • Meanwhile, heat 12-inch skillet oven medium heat until hot. Melt butter in skillet. Add the onions and cook, stirring frequently, 15 to 20 minutes or until soft and golden brown. Spread 4 crust squares with mustard; top with roast beef, caramelized onions, arugula, and gruyere. Top with a second crust square.
  • Place 2 sandwiches in skillet. Place smaller skillet or saucepan on sandwiches to flatten slightly; keep skillet on sandwiches while cooking. Cook 1 to 2 minutes on each side or until bread is crisp and fillings are heated. Repeat with remaining sandwiches.

This post was sponsored by Pillsbury and I was compensated by General Mills/Pillsbury for my time creating this recipe. All opinions are my own. 

By on December 11th, 2012

About Lauren

Hi, I'm Lauren! I'm a certified plant-based cook and enthusiastic omnivore who loves looking for creative ways to make weeknight meals more nutritious. I'm the author of Heathy Eating One Pot Cookbook and Healthy Meal Prep Slow Cooker Cookbook. I also blog at The Busy Foodie.

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3 thoughts on “Roast Beef, Caramelized Onion + Gruyere Panini”

  1. Pingback: Philly Burger (aka Cheesesteak burger): Recipe Sunday
  2. Wow, I think you have been quite inventive. (Who cares if someone else was also, independently, inventive?) It’s a clever idea, indeed. I like the flavour combination of roast beef and gruyere – yum.


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