Ingredients

  • 12 ounces wide egg noodles
  • 1/4 cup unsalted butter
  • 2 large leeks, sliced
  • 1/4 cup all-purpose flour
  • 3 cups whole milk, at room temperature
  • 4 cups gruyere cheese, shredded
  • 2 tablespoons Dijon mustard
  • 1 tablespoon lemon zest
  • 1/2 teaspoon salt
  • 4 (5 1/2 ounce) cans white tuna packed in oil, drained and flaked (look for 'chunk white' or 'chunk light' on label)
  • 3 tablespoons olive oil, extra-virgin
  • 1 teaspoon garlic, minced
  • 1 cup panko breadcrumbs (Japanese breadcrumbs)

Method

  • Cook egg noodles until al dente according to package directions. Drain, rinse with cold water, and drain again.
  • Melt butter in a medium saucepan over medium heat. Add leeks and cook, covered, 7 minutes or until tender but not browned. Whisk in flour; cook 1 minute. Pour in milk; bring mixture to a boil over medium-high heat, whisking frequently. Reduce heat to medium-low, and simmer 3 minutes or until sauce is smooth and thickened.
  • Remove from heat, and whisk in cheese and next 3 ingredients. Fold in tuna and egg noodles. Pour into a greased 3-quart baking dish.
  • Combine olive oil, garlic, and panko; sprinkle over casserole. Bake at 375 for 30 minutes or until golden brown and bubbly. Let stand 5 minutes before serving.