Roast Beef and Caramelized Onion Croissant Sandwich Recipe

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It's officially grilling season here in MN! With temps predicted to be in the 60's and 70's all week, I know my grill will be used almost every day! These are the days I enjoy the most! There's just something special about getting outside, and eating on the patio after a long winter. I love coming up with fun and creative recipes to try out on the grill, and I have a great one for you today!

I'm sharing my Roast Beef and Caramelized Onion Croissant Sandwich! This sandwich is full of roast beef and caramelized onion goodness! Have you ever caramelized onions on the grill before? They turn out smoky, sweet and fantastic and they are a perfect addition to any sandwich! Put the onions on the grill when you're making the burgers and hot dogs! Such an easy addition to any BBQ!

This croissant wouldn't be complete without the New Heinz® Yellow Mustard I topped it off with! The tangy flavor of the mustard pairs well with the sweetness of the caramelized onions! Heinz has always been a favorite brand for us, especially Heinz Ketchup! Our family is hooked and cannot use any other brand!

We just love using Heinz Yellow Mustard on all of our grilling favorites including burgers, hot dogs and sandwiches! It's always a must have condiment and we always make sure to keep some in the refrigerator! The taste is amazing, and it contains 100% natural ingredients, including stone-ground mustard seeds. Heinz Yellow Mustard has a secret blend of spices and vinegar for the perfect balance of flavor and tang. Also, no more water mess! Heinz has designed their new Mustard top-down, squeeze bottle to prevent that first squirt of watered down product. No longer must you shake the bottle before using. That's perfect for me since I always forget to shake the bottle first!

I hope you enjoy these amazing croissant sandwiches at your next BBQ!

Roast Beef and Caramelized Onion Croissant Sandwich
by Sheena

  • 3 tablespoons butter
  • 4 medium onions, halved then sliced
  • 2 tablespoons brown sugar
  • 4 large croissants, halved
  • 4 slices havarti cheese
  • 8 slices deli roast beef
  • 4 slices tomato
  • 4 pieces lettuce
  • Heinz Yellow Mustard
Preheat grill. Combine butter, sliced onions and brown sugar in a disposable aluminum dish. Grill for 30-40 minutes, until onions are caramelized, stirring occasionally. Remove from grill and set aside.
Layer the havarti, roast beef, caramelized onions, mustard, lettuce and tomato on the croissant. Serve immediately.
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Heinz Yellow Mustard launched in February and is available at your local Walmart and other retailers nationwide! Heinz Yellow Mustard comes in 8, 14 and 20 ounce bottles and is conveniently located by Heinz Ketchup in the condiment aisle! Make sure to add it to your list and grab one the next time you're out shopping!

Is Heinz Yellow Mustard something your family uses often? What's your favorite recipe to use mustard with?

This recipe is shared at: The Better Baker


  1. Caramelized onions make everything better! As does Heinz!! This sandwich looks yum. I have never made the onions on the grill before. Will definitely have to give it a go! Thanks!

  2. Yum, Caramelized onions make everything special and on a croissant? Even better! I'm a huge mustard fan too and Grumpy always tells me I have every flavor imaginable in the fridge. ha ha. I really love that new Heinz Mustard commercial too lol I thought of it when I was reading you post ;)

  3. If I could I would eat ALL my sandwiches on croissants! this one looks so good! and caramelized onions are just the icing on top! the is a perfect sandwich!

  4. I bet the caramelized onions with the roast beef and havarti and the mustard is delicious! :) This is definitely my kind of sandwich.

  5. You know, I've never been much of a mustard fan but I'm starting to come around. I'll have to look for this mustard. I love this sandwich. I'm very fond of harvarti these days.

  6. Caramelized onions sound so delicious on a sandwich with roast beef and mustard.

  7. This sandwich sounds and looks delicious! I'm going to try the Heinz Yellow Mustard soon!


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