Thanks to Ruth Daly for the recipe.
4 T butter
3/4-1 c. milk or 1/2 & 1/2
3/4-1 c. flour
2 T sugar (or so -- not necessary at all)
1 t. vanilla (also optional)
Preheat the oven to 400 F, and put the butter into a glass or clay pie pan or cake pan and into the oven. The butter will melt in the pan, and the pan will get hot and form a nice crust on the pancake. Meanwhile, in the blender, combine the eggs and milk until frothy (30 seconds or so). Add the flour in two or three batches, otherwise it will stick to the walls of the blender. Add the sugar and vanilla and salt, if you like. Blend until frothy, then pour immediately into the pie pan (make sure the butter is melted already). Bake for 20-25 minutes. It will puff up and turn all golden brown, but will fall shortly after removing, so eat it immediately!
lemon juice and powdered sugar or honey or jam
fresh fruit and whipped cream
Some people also combine fruit with the pancake in the oven. If you decide to do this, I think you can add apples with the butter in the beginning and then pour the batter over them. You can also put in sausage or ham or whatever -- in this case, omit the sugar and vanilla, but possibly add salt and pepper and rosemary or whatever spices you enjoy.