Roasted Mushroom Sandwich with Horseradish Aioli

Layers of roasty mushrooms, havarti, lemony arugula, and an easy homemade horseradish aioli make this mushroom sandwich a WINNER. A saucy, salty, hefty masterpiece!

How To Make This Mushroom Sandwich

1

Roast the mushrooms.

Toss the mushrooms with olive oil and a hefty sprinkle of seasoning (I use Cajun seasoning). Roast ’em up till they’re golden, chewy, and delicious.

Hands mixing sliced mushrooms with oil and spices.

2

Make that horseradish sauce.

Oh man, it’s so good. Mix your mayo, garlic, lemon, and horseradish together. Season with salt.

Mixing aioli in a bowl with mayonnaise, horseradish, garlic, and lemon juice.

3

Toast and split the bread.

Would highly recommend the caramelized onion focaccia from Trader Joe’s for this one.

Slicing focaccia on a cutting board.

4

Layer your sandwich.

My layers: pesto rosso (also from Trader Joe’s, and optional), mushrooms, havarti cheese (melted for funs), arugula, and horseradish sauce on top.

Placing arugula on a mushroom sandwich.

5

You’re Done! Yum.

Devour and enjoy.

Mushroom sandwich cut in half and opened.