Puerto Rican Pineapple Rum Cake

Name: Puerto Rican Pineapple Rum Cake
Prep time: 30 min
Cook time: 1 h 30 min
Total time: 2 h
Cuisine: American, Latin American, Caribbean
Ingredients: 1/2 cup packed light brown sugar; 1 1/2 cups dark rum; 1/4 cup unsalted butter; 1/2 pineapple, cored and cut into 1/4-inch-thick slices; 1 cup unsalted butter; 2 cups sugar; 4 large eggs; 1 teaspoon pure vanilla extract; 1 teaspoon dark rum; 2 1/2 cups all-purpose flour; 1/2 teaspoon kosher salt; 1/2 cup crushed pecans; vanilla ice cream, for serving