Melt 2 tablespoons butter and 2 tablespoons maple syrup in a 10” cake pan or cast iron skillet over low heat. Remove from the heat.
Beat 6 tablespoons butter and ¾ cup syrup until thoroughly combined (this may take days). Add the eggs, and beat for 1 minute.
From vvvanessa via Food52.
If you don’t have a 10” round vessel, you can either have multiple, smaller pans on hand or half the recipe and bake it for 30-35 minutes in an 8” round pan (the cake pictured here is 8").