A little searching reveals some recipes for Frisian food, including:

Grauwe earten mei spek en sjerp (marrowfats with side pork and syrup)

Sûpenbrij (basically flour and buttermilk made into a hot cereal)

Sûrkoal mei banaan (sauerkraut with banana)

Frisian sipelsop (onion soup with hard boiled eggs and cumin cheese!)