French Onion Soup Burgers with Creamy Mustard Potato Salad
Amanda Freitag

French Onion Soup Burgers

with Creamy Mustard Potato Salad

Group Created with Sketch. 45 min
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    2 Servings
  • icon-nutrition Created with Sketch. Est. 960 Cals/serving
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Blue Apron is thrilled to partner with Chef and TV personality Amanda Freitag for six weeks, highlighting her love of classic, comforting dishes coupled with fun and easy-to-follow techniques.
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fresh
ingredients
French Onion Soup Burgers with Creamy Mustard Potato Salad
Title
  • 10 oz Ground Beef
  • 2 Potato Buns
  • ¾ lb Golden Or Red Potatoes
  • 2 Scallions
  • ½ oz Dried Shiitake Mushrooms
  • 1 Tbsp Sherry Vinegar
  • 2 Tbsps Vegetarian Worcestershire Sauce
  • 2 oz White Cheddar Cheese
  • 1 Tbsp Creamy Mustard Sauce
  • 2 Tbsps Sweet Pickle Relish
  • 2 Tbsps All-Purpose Flour
  • 1 Sweet Or Yellow Onion
time-saving
tips & techniques
Prepare the ingredients
1 Prepare the ingredients

Fill a medium pot 3/4 of the way up with salted water; cover and heat to boiling on high. Wash and dry the fresh produce. Place the mushrooms in a bowl; add 1 cup of hot water. Set aside to rehydrate at least 10 minutes. Medium dice the potatoes. Thinly slice the scallions. Halve, peel, and thinly slice the onion. Grate the cheese on the large side of a box grater. Halve the buns.

Make the potato salad
2 Make the potato salad

Add the diced potatoes to the pot of boiling water. Cook 13 to 15 minutes, or until tender when pierced with a fork. Turn off the heat. Reserving the pot, drain thoroughly and transfer to a large bowl. Add the creamy mustard sauce, pickle relish, sliced scallions, and a drizzle of olive oil. Gently stir to combine. Taste, then season with salt and pepper if desired. Place in the refrigerator to cool until ready to serve. 

Cook the onion
3 Cook the onion

Meanwhile, in a medium pan (nonstick, if you have one), heat a drizzle of olive oil on medium-high until hot. Add the sliced onion; season with salt and pepper. Cook, stirring occasionally, 8 to 10 minutes, or until browned and softened. Add the vinegar (carefully, as the liquid may splatter) and worcestershire sauce. Cook, stirring frequently, 30 seconds to 1 minute, or until combined. Transfer to a bowl. Taste, then season with salt and pepper if desired. Cover with foil to keep warm. Rinse and wipe out the pan.

Form & cook the patties
4 Form & cook the patties

Place the beef in a bowl; season with salt and pepper. Gently mix to incorporate. Form the mixture into two 1/2-inch-thick patties. In the same pan, heat a drizzle of olive oil on medium-high until hot. Add the patties. Cook 4 to 5 minutes per side (flipping carefully, as the oil may splatter), or until browned and cooked through.* Transfer to a plate. Rinse and wipe out the pan.

*An instant-read thermometer should register 160°F.

Make the cheese sauce
5 Make the cheese sauce

Meanwhile, reserving the mushroom liquid, drain the rehydrated mushrooms; discard the mushrooms. In the same pot, heat 1 tablespoon of olive oil on medium-high until hot. Add the flour. Cook, stirring frequently with a wooden spoon, 1 to 2 minutes, or until lightly browned and thoroughly combined. Add the reserved mushroom liquid to the pot (carefully, as the liquid may splatter). Cook, whisking constantly, 3 to 4 minutes, or until thickened. Turn off the heat; whisk in the grated cheese until melted and combined. Season with salt and pepper.

Toast the buns & serve your dish
6 Toast the buns & serve your dish

Add the halved buns, cut side down, to the same, dry pan. Toast on medium-high 30 seconds to 1 minute, or until lightly browned. Transfer to a work surface. Assemble the burgers using the toasted buns, cooked patties, cheese sauce, and cooked onion. Serve the burgers with the potato salad on the side. Enjoy!

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Prepare the ingredients
1 Prepare the ingredients

Fill a medium pot 3/4 of the way up with salted water; cover and heat to boiling on high. Wash and dry the fresh produce. Place the mushrooms in a bowl; add 1 cup of hot water. Set aside to rehydrate at least 10 minutes. Medium dice the potatoes. Thinly slice the scallions. Halve, peel, and thinly slice the onion. Grate the cheese on the large side of a box grater. Halve the buns.

2 Make the potato salad

Add the diced potatoes to the pot of boiling water. Cook 13 to 15 minutes, or until tender when pierced with a fork. Turn off the heat. Reserving the pot, drain thoroughly and transfer to a large bowl. Add the creamy mustard sauce, pickle relish, sliced scallions, and a drizzle of olive oil. Gently stir to combine. Taste, then season with salt and pepper if desired. Place in the refrigerator to cool until ready to serve. 

Make the potato salad
Cook the onion
3 Cook the onion

Meanwhile, in a medium pan (nonstick, if you have one), heat a drizzle of olive oil on medium-high until hot. Add the sliced onion; season with salt and pepper. Cook, stirring occasionally, 8 to 10 minutes, or until browned and softened. Add the vinegar (carefully, as the liquid may splatter) and worcestershire sauce. Cook, stirring frequently, 30 seconds to 1 minute, or until combined. Transfer to a bowl. Taste, then season with salt and pepper if desired. Cover with foil to keep warm. Rinse and wipe out the pan.

4 Form & cook the patties

Place the beef in a bowl; season with salt and pepper. Gently mix to incorporate. Form the mixture into two 1/2-inch-thick patties. In the same pan, heat a drizzle of olive oil on medium-high until hot. Add the patties. Cook 4 to 5 minutes per side (flipping carefully, as the oil may splatter), or until browned and cooked through.* Transfer to a plate. Rinse and wipe out the pan.

*An instant-read thermometer should register 160°F.

Form & cook the patties
Make the cheese sauce
5 Make the cheese sauce

Meanwhile, reserving the mushroom liquid, drain the rehydrated mushrooms; discard the mushrooms. In the same pot, heat 1 tablespoon of olive oil on medium-high until hot. Add the flour. Cook, stirring frequently with a wooden spoon, 1 to 2 minutes, or until lightly browned and thoroughly combined. Add the reserved mushroom liquid to the pot (carefully, as the liquid may splatter). Cook, whisking constantly, 3 to 4 minutes, or until thickened. Turn off the heat; whisk in the grated cheese until melted and combined. Season with salt and pepper.

6 Toast the buns & serve your dish

Add the halved buns, cut side down, to the same, dry pan. Toast on medium-high 30 seconds to 1 minute, or until lightly browned. Transfer to a work surface. Assemble the burgers using the toasted buns, cooked patties, cheese sauce, and cooked onion. Serve the burgers with the potato salad on the side. Enjoy!

Toast the buns & serve your dish