Spring Vegetable Macaroni and Cheese

Bahan-bahan (6 porsi)

• 1 bunch (12 ounces) asparagus
• 2 medium leeks
• 4½ tablespoons butter, (divided)
• 1 teaspoon salt, (divided)
• 12 ounces dried orecchiette pasta
• ¾ cup frozen peas
• 2 slices sourdough bread
• 3 tablespoons all purpose flour
• 2 teaspoons chopped fresh thyme
• 3 cups milk
• 2 teaspoons grated lemon zest
• 1 tablespoon Dijon mustard
• ½ teaspoon freshly ground black pepper
• 6 ounces crumbled goat cheese
• 1½ cups shredded Romano cheese, (divided)