INGREDIENTS
1 1/2 tsp
baking powder
10 oz
(2-1/4 cups) all-purpose flour; more for the pan
1 tbsp
vanilla extract
2 cups
sugar
3/4 cup
canola or other mild-flavored oil (check for freshness before using)
1/2 tsp
baking soda
6 oz
unsalted butter, softened; more for the pan
1 1/2 tbsp
finely minced lemon zest (from about 2 lemons)
3/4 cup
strained fresh orange juice
5
large eggs
1 cup
confectioners' sugar, divided
1/2 cup
frozen orange juice concentrate, thawed
2 tbsp
dark rum
1 tbsp
unsalted butter, melted