Perfect Parkin - cooking recipe

Ingredients

1/2 cup butter
2/3 cup packed dark brown sugar
1/2 cup golden syrup (such as Lyle's(R))
1 tablespoon golden syrup (such as Lyle's(R))
1/3 cup molasses
1 1/2 cups self-rising flour
1/2 teaspoon baking soda
1 cup quick cooking oats
1 large egg
1/2 cup whole milk

Preparation

Preheat oven to 300 degrees F (150 degrees C). Grease a 9-inch square baking pan and line with parchment paper.
Stir together butter, sugar, 1/2 cup plus 1 tablespoon golden syrup, and molasses in a saucepan and cook over low heat, stirring constantly, until butter is melted and mixture is smooth, 4 to 5 minutes. Remove from heat and let mixture cool 5 minutes.
Whisk flour, baking soda, and oats together in a large bowl. Stir in butter mixture. Add egg, then milk, and stir until well combined. Pour batter into prepared pan and spread evenly.
Bake until a toothpick inserted into center comes out clean, about 1 hour 20 minutes. Remove from oven and let cool completely in pan, about 1 1/2 hours.
Cover pan tightly with foil or plastic wrap, without letting it touch surface of cake, and let stand at room temperature for at least 1 day and up to 5. Cut into squares and serve.