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Place the finely sliced yellow onions into a large bowl and cover them with cold water. Let the onions soak for 10 minutes to reduce their pungency, then drain thoroughly and pat dry with a clean towel.

In a separate large bowl, whisk together the all-purpose flour and 1 1/4 cups of water until a smooth batter forms. Ensure there are no lumps.

Add the drained onions, kosher salt, freshly ground black pepper, chopped fresh rosemary leaves, plain breadcrumbs, and grated Parmigiano cheese to the batter. Mix everything thoroughly until all ingredients are well combined and the onions are evenly coated.

Preheat your oven to 400°F. Line a large baking sheet (approximately 13x18 inches) with parchment paper. Drizzle 2 tablespoons of the olive oil evenly over the parchment paper, then sprinkle 1 tablespoon of the semolina flour over the oil.

Pour the onion and batter mixture onto the prepared baking sheet. Using your hands or a spatula, spread the mixture evenly across the parchment paper, ensuring it forms a uniform layer.

Drizzle the remaining 2 tablespoons of olive oil over the top of the spread mixture. Sprinkle the remaining 1 tablespoon of semolina flour over the top as well.

Bake for 25 to 30 minutes, or until the Onion Schiacciata is golden brown and crispy around the edges and cooked through in the center. The exact baking time may vary depending on your oven.

Remove from the oven and let cool slightly on the baking sheet. Cut into individual squares or rectangles for serving. Serve warm or at room temperature.


Place the finely sliced yellow onions into a large bowl and cover them with cold water. Let the onions soak for 10 minutes to reduce their pungency, then drain thoroughly and pat dry with a clean towel.

In a separate large bowl, whisk together the all-purpose flour and 1 1/4 cups of water until a smooth batter forms. Ensure there are no lumps.

Add the drained onions, kosher salt, freshly ground black pepper, chopped fresh rosemary leaves, plain breadcrumbs, and grated Parmigiano cheese to the batter. Mix everything thoroughly until all ingredients are well combined and the onions are evenly coated.

Preheat your oven to 400°F. Line a large baking sheet (approximately 13x18 inches) with parchment paper. Drizzle 2 tablespoons of the olive oil evenly over the parchment paper, then sprinkle 1 tablespoon of the semolina flour over the oil.

Pour the onion and batter mixture onto the prepared baking sheet. Using your hands or a spatula, spread the mixture evenly across the parchment paper, ensuring it forms a uniform layer.

Drizzle the remaining 2 tablespoons of olive oil over the top of the spread mixture. Sprinkle the remaining 1 tablespoon of semolina flour over the top as well.

Bake for 25 to 30 minutes, or until the Onion Schiacciata is golden brown and crispy around the edges and cooked through in the center. The exact baking time may vary depending on your oven.

Remove from the oven and let cool slightly on the baking sheet. Cut into individual squares or rectangles for serving. Serve warm or at room temperature.
