Esfirra Lebanese Sfiha

Name: Esfirra (Lebanese Sfiha)
Ingredients: * 1 pound lean ground beef (at least 93% lean); * 2 tablespoon olive oil; * 1 cup chopped onion; * 1/2 cup chopped fresh parsley; * 1 medium tomato, chopped, with skin but without seed; * 1 tablespoon tahini; * 3-4 teaspoon fresh lime juice, 1 lime; * 1 teaspoon finely chopped fresh mint; * 1 pinch 7 spice (optional); * salt; * pepper; * 1 egg yolk and 2 tablespoon of water for an egg wash; * for the dough; * 2 1/2 cup flour; * 1 cup warm milk; * 1 teaspoon dry, active yeast; * 5 teaspoon sugar; * 3/4 teaspoon salt; * 1 tablespoon olive oil