Place cast iron pan in oven as it comes to temperature. Add butter and melt during the last 4-5 minutes . Remove pan from oven and swirl to coat the sides.
Pour in the batter and place the skillet in the oven. Bake for 15 - 20 minutes, until the pancake has browned lightly on edges and has puffed up.
While pancake is cooking, prepare the fruit by tossing the strawberries with the sugar and lemon. Macerate a few of the berries with a fork and set aside.