Spinach and Feta Turnovers

Bahan-bahan (6 porsi)

• 1 tsp extra virgin olive oil
• ¼ cup onion ((finely chopped))
• 3 cloves garlic ((minced))
• 7 oz spinach leaves
• Diamond Crystal kosher salt ((for taste))
• freshly ground black pepper ((for taste))
• 1 tsp lemon juice
• 1 large egg (50 g w/o shell) ((separated))
• 3 oz feta cheese ((crumbled))
• 12 oz frozen puff pastry ((defrosted))
• Za’atar