Greek Custard Pie (Galaktoboureko)

INGREDIENTS

• :
• 6 cups whole milk
• 1 cup fine semolina
• ¾ cup granulated sugar, divided
• 1 tablespoon unsalted butter
• 1 teaspoon vanilla extract
• 3 eggs
• Zest of 1 orange
• 1 package phyllo dough, about 12 to 16 sheets
• 1 cup unsalted butter
• 1½ cups granulated sugar
• 1 cup water
• ¼ cup orange juice
• ½ teaspoon vanilla extract