Caramelized Onion & Mushroom Cast-Iron Pizza
I am obsessing over this caramelized onion & mushroom cast-iron pizza. It’s combining all my favorite things – caramelized onions, crispy sautéed mushrooms, pizza & fontina cheese. Literally perfect combos. All made in a cast-iron with the dough crisped on the stovetop and finished in the oven – it’s that simple.
To make the caramelized onions, I used sweet onions, olive oil, butter, red wine, balsamic, sugar, soy sauce, salt & pepper. You’ll thinly slice and let your onions cook down with all these ingredients for hours; then layer it on your dough to finish off the pizza – the results are immaculate!

Ingredients
- For the Caramelized Onions
- 4 sweet onions thinly sliced
- 4 tablespoons olive oil
- 1 tablespoon butter
- 1/4 th cup red wine
- 1 tablespoon balsamic
- 1/2 tablespoon sugar
- 1 tablespoon soy sauce
- salt and pepper to taste
- For the Pizza
- 1 lb pizza dough room temp olive oil for dough
- 3 cups assorted mushrooms we used crimini, maitake, shiitake
- 1 tablespoon balsamic vinegar
- 1 tablespoon red wine
- 1/2 juice of lemon
- 8 oz shredded fontina
- salt and pepper to taste
- top with thyme and basil
Instructions
- Start by caramelized your onions, slice and set aside. In a skillet add a drizzle of olive oil and add your onions in. Let them cook down for about 15 minutes. Season with salt, pepper for about 20 minutes on medium-low heat.
- Once your onions are cooked down and sweated out, add in your butter, wine, balsamic, sugar and soy sauce. Let everything caramelize for 2-3 hours on medium-low until it becomes a caramelized, dark color. Set aside. Preheat your oven to 425 degrees.
- In the meantime, grill your assorted mushrooms as well with salt pepper, red wine, balsamic and lemon juice, about 20 minutes until crisp.
- Start laying out your dough in the cast iron with olive oil. Add on your shredded fontina,
- mushrooms and onions. On the stove top on high heat, crisp the bottom of the dough for
- about 5 minutes. Then transfer to the oven and bake for 45-1 hr until the dough is cooked
- throughout and the cheese is melted. Remove, top with basil and thyme, slice and serve.
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