Preheat your oven to 350°F (175°C). Grease a 9-inch round cake pan.
Pour the melted coconut oil into the pan and sprinkle the brown sugar evenly over the oil.
Arrange the pineapple slices on top of the sugar mixture and place a cherry in the center of each pineapple slice.
In a mixing bowl, whisk together the flour, granulated sugar, baking powder, baking soda, and salt.
In another bowl, mix the almond milk, melted coconut oil, apple cider vinegar, and vanilla extract.
Combine the wet and dry ingredients, stirring until just combined.
Pour the batter over the pineapple slices in the pan.
Bake for 45 minutes or until a toothpick inserted into the center comes out clean.
Let the cake cool in the pan for 10 minutes, then invert onto a serving plate.