Preheat oven to 325 degrees F.
Grease a 3-quart baking dish. Pour in the syrup and lemon juice. Butter each slice of bread on one side and cut into ¾-inch cubes.
In a medium bowl, whisk together the eggs, egg yolks, cream, cinnamon, nutmeg, sea salt, and vanilla or rum. Add fruit and bread cubes and toss just until coated. Pour into baking dish. Bake 1 hour. The syrup will sink to the bottom and create a layer of thick maple goodness. Drizzle with another ¼ cup maple syrup and serve.
From Delicious Maine Desserts by Cynthia Finnemore Simonds