Salmon Wellington

Bahan-bahan (2 porsi)

• 1 tablespoon unsalted butter
• 1/2 tablespoon Dijon mustard
• Zest of 1 small lemon (about ¾ teaspoon)
• 3/4 teaspoon kosher salt (divided)
• ½ teaspoon ground black pepper (divided)
• ½ teaspoon dried thyme
• 2 teaspoons extra virgin olive oil
• 4 cups fresh baby spinach
• 2 cloves garlic (minced)
• 2 tablespoons freshly grated Parmesan cheese
• 1 large egg yolk (plus 1 teaspoon water)
• 1 sheet frozen puff pastry (thawed in the refrigerator)
• 2, 6 - ounce salmon fillets (skin removed)