Sunday Brunch: Bacon Butty with House of Parliament Sauce Recipe

Name: Sunday Brunch: Bacon Butty with House of Parliament Sauce Recipe
Ingredients: HP Sauce:; 4 tomatoes, roughly chopped; 1/2 cup light brown sugar; 1 onion, roughly chopped; 1 lemon, sliced; 1/4 cup white vinegar; 1 tablespoon salt; 1 tablespoon ground allspice; 1 teaspoon crushed black pepper; 1 tablespoon Worcestershire sauce; 3/4 cup dried chopped dates; 1/2 cup water; 1/2 cup canned chopped tomatoes (or another fresh tomato); 2 tablespoons corn starch; Butty:; 1 pound bacon; 4 crusty rolls