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Roast Beef Sandwich with French Onion Dip and Crispy Shallots

Roast Beef Sandwich with French Onion Dip and Crispy Shallots

French onion dip really isn’t from France; it is about as American as apple pie. Making the dip from scratch is a cinch and it's so good on its own you may just want to enjoy it with potato chips.

  • Prep Time: 20 minutes
  • Total Time: 1 hour plus chilling time
  • Yield: 4 sandwiches


  • 2 tablespoons olive oil
  • 2 tablespoons butter
  • 1 small yellow onion, thinly sliced
  • 3 large shallots, thinly sliced
  • 3 green onions, thinly sliced, white and green parts reserved separately
  • 1 clove garlic
  • 1/2 cup mayonnaise, homemade or store-bought
  • 1/2 cup crème fraîche
  • 1 tablespoon freshly squeezed lemon juice
  • 2 teaspoons sea salt
  • 1 pound thinly sliced roast beef
  • 8 slices sourdough sandwich bread, lightly toasted
  • Crispy Shallots


  • In a medium saucepan, heat the olive oil and butter over medium-low heat. Add the yellow onion, shallots, the white portion of the green onions, and the garlic. Cover and cook, stirring occasionally, for 20 minutes, or until the onions are completely soft. (Do not let them caramelize; if they begin to brown, add a little water to the pan.)

  • Remove one-third of the mixture from the pan and set it aside. Transfer the remaining mixture to a blender and purée until smooth.

  • Combine the reserved onion mixture with the puréed onions in a bowl. Add the mayonnaise, crème fraîche, lemon juice, and sea salt, and mix well. Refrigerate, covered, for 2 hours and up to 24 hours.

  • Divide the roast beef among 4 slices of the toast. Spoon 3 tablespoons (or more to taste) of the onion sauce over the roast beef, and sprinkle with the fried shallots. Top with the remaining slices of toast, and serve with the remaining onion sauce on the side, if desired. (Any leftover onion sauce will keep in the refrigerator for up to 3 days and is wonderful with chips.)