For those that don't know what Pannukakkua is, it is not really a pancake as the name suggests.
It is basically a large pan of custard, instead of using the individual custard cups. I don't agree with the reviews that the butter should settle on top because it becomes clarified and tasteless, unless there's something I'm missing here.
I am also a "Soumalainen", Finn and don't like the grease that would be left on top if not mixed well.
In a large bowl, beat eggs with a fork, wire wisk or egg beater. Gradually add 1/2 cup of milk. Add remaining milk, flour, salt and sugar. Beat until smooth.
Melt butter in a 13x9-inch glass pan by placing it in the oven until the butter melts and pour mixture into it. Mix well with the butter. Bake at 450°F for 30 minutes or until top becomes brown.
Serve plain, with syrup, or covered with berries.
The first time I made this, the butter settled on top, so mixing it thoroughly is important.