Portobello Mushroom Katsu Sandwich

Name: Portobello Mushroom Katsu Sandwich
Prep time: 15 min
Cook time: 15 min
Total time: 30 min
Cuisine: Japanese
Ingredients: 2 large Portobello mushrooms; 1 cup panko breadcrumbs; 2 large eggs; 1/2 cup all-purpose flour; 1/4 cup neutral cooking oil (canola or vegetable); 4 slices sourdough or ciabatta bread; 1/4 cup katsu sauce; Lettuce and tomato slices (as desired)

Published: August 15, 2025

by Sarah Connor

Why You'll Love This Recipe

The Portobello Mushroom Katsu Sandwich is super easy to prepare in under 30 minutes
Its umami-packed flavor profile will leave your taste buds wanting more
Visually stunning with its golden-brown crust, it’s sure to impress anyone at your dinner table
Versatile enough to switch up sauces and toppings based on what you have on hand

I’ll never forget the first time I made this sandwich for my family. The moment I served it, jaws dropped, forks hovered mid-air, and then came the chorus of “Wow!” from my kids. They devoured those sandwiches as if they were made of pure gold!

Essential Ingredients

Here’s what you’ll need to make this delicious dish: delicious monster burgers.

Portobello Mushrooms: Choose large, firm mushrooms for the best texture; they should be fresh and not slimy.
Panko Breadcrumbs: These Japanese-style breadcrumbs add an incredible crunch; don’t substitute them for regular breadcrumbs.
Eggs: Use large eggs for breading; they help everything stick beautifully together during frying.
All-Purpose Flour: A light dusting helps create a crispy outer layer; avoid skipping this step!
Cooking Oil: Use a neutral oil like canola or vegetable oil for frying; this keeps the flavors focused on the mushrooms.
Sandwich Bread: Choose thick slices of bread like sourdough or ciabatta for added sturdiness; it holds everything together well.
Katsu Sauce: This sweet and savory sauce is essential for dipping; pick your favorite store-bought version or make your own! sweet potato lentil patties.
Lettuce & Tomato: Fresh greens and tomato slices add brightness and balance to the rich flavors.

The full ingredients list, including measurements, is provided in the recipe card directly below.

Let’s Make it Together

Prepare Your Workstation: Gather all your ingredients and tools—this includes plates for flouring and breading mushrooms as well as a frying pan prepped with oil over medium heat.

Bread the Mushrooms:Start by gently wiping your portobello mushrooms with a damp cloth to clean them. Then remove their stems and give them a light sprinkle of salt before dredging them in flour.

Coat with Egg Mixture: Dip each floured mushroom into beaten eggs until well-coated; this creates a sticky surface for those glorious panko breadcrumbs to cling onto.

Drench in Panko Breadcrumbs: Now it’s time for the fun part! Coat each mushroom generously with panko breadcrumbs until they are fully covered. This is where that crunch magic happens!

Fry Until Golden Brown: Carefully place each coated mushroom into hot oil and fry until golden brown—about 3-4 minutes per side. You’ll know they’re ready when they emit that delicious aroma!

Assemble Your Sandwiches!: Once fried to perfection, let them drain on paper towels briefly before assembling your sandwiches with lettuce, tomato slices, katsu sauce, and any other toppings you desire.

With these steps, you’ll soon find yourself savoring each bite of your Portobello Mushroom Katsu Sandwich—a delightful creation that’s not just food but an experience! Enjoy every moment as you indulge in these crispy delights that are both satisfying and incredibly tasty! nutritious bean salad.

You Must Know

The Portobello Mushroom Katsu Sandwich is a delightful twist on the classic katsu
Its crispy texture and savory flavors make it a crowd-pleaser, whether you’re serving it at a party or enjoying it solo
Don’t forget to pair it with tangy sauce for extra zest!

Perfecting the Cooking Process

Start by marinating the Portobello mushrooms to enhance their flavor. Then, bread them in panko and fry until golden. Meanwhile, prepare your sandwich toppings for a seamless assembly.

Add Your Touch

Feel free to swap out the mushrooms for eggplant or zucchini if desired. Experiment with different sauces like spicy mayo or tangy barbecue for added flavor.

Storing & Reheating

Store leftovers in an airtight container in the fridge. Reheat in an oven at 350°F for about 10 minutes to maintain crispiness.

Chef's Helpful Tips

For ultimate crunchiness, use fresh panko breadcrumbs instead of regular ones
Ensure your oil is hot enough before frying for perfect results
Always let the katsu drain on paper towels to remove excess oil and keep it crispy

Creating this Portobello Mushroom Katsu Sandwich was a game-changer during my vegetarian friend’s surprise birthday party; everyone was impressed and went back for seconds! For more inspiration, check out this Mozzarella Pepperoni Croissant Rolls recipe.

FAQ

Can I use other vegetables instead of Portobello mushrooms?

Absolutely! Eggplant or zucchini work beautifully in this recipe.

What is the best sauce to pair with this sandwich?

Tonkatsu sauce is traditional, but spicy mayo adds a fun twist!

How do I make sure my katsu stays crispy after cooking?

Allow it to drain on paper towels after frying to keep that delightful crunch!

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📖 Recipe Card