Ingredients
- 1/2 cup olive oil, plus more as needed
- 2 pounds (2 heads) broccoli, separated into small florets, stems peeled and diced
- 2 1/2 teaspoons kosher salt, more to taste
- 2 tablespoons unsalted butter
- 1 large Spanish onion, diced
- 5 cloves garlic, chopped
- 1/2 teaspoon black pepper, more for finishing
- 1/4 teaspoon red pepper flakes
- 1/2 pound potatoes, peeled, and thinly sliced
- 1/4 teaspoon finely grated lemon zest
- 1 1/2 tablespoons fresh lemon juice, more to taste
- Grated or shaved Parmesan, to finish (optional)
- Flaky sea salt, to finish
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