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Freshly baked caramelized onion calzone
Rich and savory calzone filled with balsamic onions and cheese

Caramelized Onion and Balsamic Calzone

Author: Flavelo
Recipes Vegetarian & Vegan Dishes Main Courses
A calzone is essentially a 'folded pizza,' but the technique relies on steam. While pizza bakes in dry heat, the calzone filling steams inside its crust, hermetically sealing the flavors. The sweetness of roasted onions and the acidity of balsamic vinegar (agrodolce) create a classic Italian pairing that finds perfect balance with salty cheese.
🕒 Prep Time 20 mins
🍳 Cook Time 18 mins
⌛ Total Time 38 mins
🍽️ Servings 4 servings
🔥 Calories 560 kcal
🌍 Cuisine Italian

Ingredients

Equipment Needed

  • Rolling Pin
  • Baking Sheet
  • Skillet for onions
  • Pastry Brush

Allergen Information

⚠️ Wheat
⚠️ Milk
⚠️ Egg

Instructions

1 ✓

Slice the onion into thin half-moons. Heat the oil over medium heat, add the onions, and sauté slowly and patiently until deep golden brown and soft.

Tip: This is caramelization. The natural sugars break down into complex flavor molecules. Don't rush it or they will burn!
2 ✓

Add the crushed garlic and balsamic vinegar. Stir until the vinegar evaporates but leaves its flavor. Season with salt, pepper, and oregano. Let cool completely.

Tip: Cooling is crucial! Putting hot filling on raw dough will make it soggy and prevent the bottom from baking through.
3 ✓

Mix the shredded cheeses with the cooled onion mixture.

Tip: Mozzarella provides the stretch, while Parmesan adds a savory, salty kick (umami).
4 ✓

Roll the dough into circles. Pile the filling on one half, leaving a 1-inch border.

Tip: Don't roll it paper-thin, or the weight of the filling might tear it.
5 ✓

Fold the dough over, pressing the edges together with a fork to seal. Poke 2-3 steam vents in the top.

Tip: Steam vents are vital; without them, the calzone will puff up and potentially burst.
6 ✓

Brush the top with beaten egg and bake at 400°F (200°C) for 15-18 minutes until deep golden brown.

Tip: The egg white adds shine, and the yolk promotes browning.

Recipe FAQ

Why did it open while baking?
You didn't seal the edges tightly enough, or you overfilled it and the steam forced it open.

Ingredients

  • 1 lb Pizza Dough (store-bought or homemade)
  • 1 large Yellow Onion
  • 1 1/2 cups Low-Moisture Mozzarella Cheese (shredded)
  • 1/2 cup Parmesan Cheese (grated)
  • 2 cloves Garlic
  • 2 tsp Balsamic Vinegar
  • 2 tsp Olive Oil
  • 1 tsp Dried Oregano
  • 1 tsp Salt
  • 1 pinch Cracked Black Pepper
  • 1 large Egg (for egg wash)