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Broccoli And Cauliflower Gratin

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Broccoli And Cauliflower Gratin

Ingredients

  • 2 pounds broccoli
  • 2 pounds cauliflower (about 1 large head)
  • 4 tablespoons unsalted butter, divided
  • 1 small sweet onion, diced
  • 2 cloves garlic, minced
  • 1/4 cup all-purpose flour
  • 2 cups whole milk, scalded
  • 1 cup grated gruy√®re cheese
  • 1 /2 teaspoon mustard powder
  • 1/2 cup panko
  • 1/4 cup grated parmigiano-reggiano cheese
  • 1 tablespoon olive oil
  • kosher salt and freshly ground pepper, to taste
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