Steak and Sweet Potato Galette

Name: Steak and Sweet Potato Galette
Ingredients: For the pastry dough; 1 3/4 cups Flour (plus more for dusting); 1 tablespoon Sugar; 8 tablespoons (1 stick) Butter; 1/2 cup Ice Water; For the filling; 12 ounces (1 can) cut sweet potatoes; 3 cloves of garlic; Tablespoon olive oil; 1 pound cube steak; 1 tablespoon soy sauce; 1 teaspoon sugar; 1 teaspoon cayenne pepper; 1/4 cup lemon juice; 1/2 green bell pepper, sliced into strips; 1 egg, beaten + 1 tablespoon hot water; 1 tablespoon melted butter