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Sandwiches

Vietnamese Sandwiches with Tempura Sweet Potato and Avocado (Vegan Banh Mì)

Vietnamese Sandwiches with Tempura Sweet Potato and Avocado (Vegan Banh Mì)

[Photographs: J. Kenji Lopez-Alt]

Note: For even lighter batter, replace 1/4 cup of seltzer with 1/4 cup ice cold vodka.

About the author: J. Kenji Lopez-Alt is the Chief Creative Officer of Serious Eats where he likes to explore the science of home cooking in his weekly column The Food Lab. You can follow him at @thefoodlab on Twitter, or at The Food Lab on Facebook.

Every recipe we publish is tested, tasted, and Serious Eats-approved by our staff. Never miss a recipe again by following @SeriousRecipes on Twitter!

Vietnamese Sandwiches with Tempura Sweet Potato and Avocado (Vegan Banh Mì)

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About This Recipe

Yield:Serves 4
Active time:30 minutes
Total time:30 minutes
Special equipment:Wok, Dutch oven, or deep fryer
This recipe appears in: The Vegan Experience: Vietnamese Sandwiches with Tempura Sweet Potato and Avocado (Vegan Banh Mì)

Ingredients

  • 1 1/2 quarts vegetable, peanut, or canola oil
  • 1/2 cup all-purpose flour
  • 1/4 cup cornstarch
  • Kosher salt
  • 3/4 cup ice cold seltzer water (See note)
  • 1 sweet potato, cut in half lengthwise, then cut into 1/4 to 1/8-inch planks
  • 4 Vietnamese-style baguettes, or four soft hoagie rolls
  • 2 teaspoons liquid aminos, such as Maggi or Bragg's
  • 1 avocado, thinly sliced
  • 1 recipe Hainnanese Ginger-Scallion Oil
  • 1 recipe Vietnamese Pickled Carrots and Daikon (do chua)
  • 1 cucumber, seeds removed, split lengthwise into 8 spears
  • 1 jalapeño pepper, seeds and stem removed, sliced into thin spears
  • 1 bunch cilantro leaves and fine stems

Procedures

  1. 1

    Preheat oven to 350°F. Heat oil in a large wok, Dutch oven, or deep fryer to 400°F. Combine flour, cornstarch, and 1/2 teaspoon salt in a medium bowl and stir with chopsticks to combine. Add soda water and stir rapidly to combine. Do not overmix (some lumps are ok). Add sweet potato slices and working one piece at a time, lift potato slice, allow excess batter to drip back into bowl, then slowly lower into hot oil. Repeat until all potato slices are in the fryer. Cook, agitating and flipping slices constantly until pale golden brown and very crisp, about 2 minutes. Transfer sweet potato slices to a paper towel-lined plate and season with salt.

  2. 2

    Place baguettes in oven until crisp, about 4 minutes. Split baguettes. Sprinkle bottoms and tops with liquid aminos, then spoon on a thin layer of the ginger-scallion oil. Spread half of avocado along bottom surface os sandwich, then divide sweet potatoes on top of avocado. Top sweet potatoes with more ginger-scallion oil, then add pickled carrot/daikon mixture, cucumber spears, jalapeño, and cilantro. Spread remaining avocado on top half of bun. Season to taste with salt, then close sandwiches, split in half crosswise, and serve immediately.

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