Add the berries to a mixing bowl. Collect about 1/2 tsp zest from the lemon, then set the zest aside. Juice the lemon onto the berries and toss. Lightly mash the berries if desired.
Preheat the oven to 425 F and put the unmelted butter in a medium cast iron skillet.
While the oven's heating, add the eggs, milk, melted butter, vanilla extract, flour, and salt to a blender, and blend until frothy, about 1 minute.
Once the oven's hot, put the skillet in to let the butter melt, about 3 to 5 minutes. Swirl the butter around to coat the bottom, then pour the batter in. Pour the berries in the middle, then return to the oven.
Bake until the edges are browned and puffy, about 20 to 22 minutes.
Serve warm, with a side of whipped cream or cottage cheese.
Notes
Also known as a German pancake, this fluffy dessert is good no matter what you call it or what you top it with.
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