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


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.


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.


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.


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.


You’re Done! Yum.

Devour and enjoy.

Mushroom sandwich cut in half and opened.