Cheese and Herb Sambousek

Ingredients

• DOUGH:
• 3 cups all-purpose flour
• 1 teaspoon kosher salt
• 8 tablespoons 1 stick unsalted butter
• ½ cup vegetable oil
• ½ cup hot water
•  
• FILLING:
• 2 cups crumbled feta (about 8 ounces)
• 2 cups grated kashkaval cheese (about 8 ounces)
• 2 large eggs (lightly beaten)
• 3 tablespoons finely chopped fresh mint
• 3 tablespoons finely chopped fresh parsley
• 3 tablespoons finely chopped fresh tarragon
• ½ teaspoon kosher salt (plus more to taste)
• ¼ teaspoon red pepper flakes (plus more to taste)
• TO ASSEMBLE:
• 1 large egg
• 1 tablespoon whole milk (cream, or water)
• Sesame or poppy seeds (for sprinkling)