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Homemade Caramelized Onion and Portobello Mushroom Sliders with Fry Sauce image
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Caramelized Onion and Portobello Mushroom Sliders with Fry Sauce

These sliders are a flavor explosion! Soft buns filled with caramelized onions, savory portobello mushrooms, and zesty fry sauce make them irresistible.
Prep Time20 minutes
Cook Time25 minutes
Total Time45 minutes
Servings: 6 servings

Ingredients

  • 1 medium sweet Vidalia onion or yellow onion peeled and sliced
  • 2 to 3 tablespoons olive oil divided
  • 4 ounces sliced baby portobello mushrooms
  • 1 cup diced Vlasic Farmers Garden Bread and Butter Chip pickles
  • 1 teaspoon pickle juice
  • 6 slider buns or Hawaiian rolls
  • ½ cup ketchup
  • ½ cup mayo or Miracle Whip; use vegan mayo to keep vegan
  • About 3 teaspoons pickle juice or to taste
  • A pinch onion powder optional and to taste

Instructions

  • In a large skillet, heat 1 tablespoon of olive oil over medium heat. Add the sliced Vidalia or yellow onion and a pinch of salt. Cook the onions, stirring occasionally, for about 15-20 minutes or until they are golden brown and caramelized. If the onions begin to stick, add a splash of water to deglaze the pan.
  • Once the onions are caramelized, push them to one side of the skillet. Add another tablespoon of olive oil to the empty side and add the sliced portobello mushrooms. Sauté the mushrooms for about 5-7 minutes until they are tender and have released their moisture. Mix the mushrooms with the onions and season with salt and pepper to taste.
  • In a mixing bowl, combine the ketchup, mayo (or vegan mayo), and pickle juice. Stir until smooth and well blended. Taste and adjust the seasoning, adding more pickle juice if desired, and a pinch of onion powder for extra flavor.
  • Slice the slider buns or Hawaiian rolls in half. Spread a generous amount of fry sauce on the bottom half of each bun. Top with a spoonful of the caramelized onion and portobello mushroom mixture. Add a few diced pickles on top for crunch and flavor. Place the top half of the bun on each slider.
  • Arrange your sliders on a serving platter and serve immediately. These sliders are best enjoyed fresh but can also be made ahead of time and reheated when needed.

Equipment

  • Large Skillet
  • Spatula
  • Cutting Board
  • Knife
  • Mixing Bowl
  • Serving Platter

Notes

  • Leftover sliders can be stored in an airtight container in the refrigerator for up to 3 days.
  • To reheat, place them in a preheated oven at 350°F (175°C) for about 10-15 minutes.
  • For a fall twist, add some roasted butternut squash or pumpkin puree.
  • Try adding sautéed spinach or arugula for an added layer of flavor.
  • For a spicy kick, add sliced jalapeños or a drizzle of sriracha to the fry sauce.