Thaw the spinach. Combine with the milk and eggs in a blender. Add flour, baking powder, 1 ½ tbsp. soy sauce, sugar and butter; mix to create a smooth batter. Leave to rest for approx. 30 minutes.
Fry small portions of the batter in hot oil to make the pancakes.
Mix together the crème fraîche, chives and remaining soy sauce. Garnish the pancakes with it and serve.