Rum Raisin Irish Soda Bread

Name: Rum Raisin Irish Soda Bread
Ingredients: 1 1/4 cup (7 1/2 oz./235 g) packed raisins; 3/4 cup (6 fl. oz./180 ml) Jameson Irish Whiskey or another Irish whiskey; 4 1/4 cups (7 1/2 oz./510 g) plus 1 Tbs. bread flour, plus more for dusting; 1 1/2 tsp. kosher salt; 2 tsp. baking powder; 2 tsp. baking soda; 2/3 cup (5 oz./155 g) granulated sugar; 4 Tbs. (1/2 stick) (2 oz./60 g) cold salted Irish butter, plus more for serving; 1 egg, lightly beaten; 1 3/4 cup (14 fl. oz./430 ml) buttermilk