Preheat oven to 375°F (190°C).
Slice the phyllo pastry and set aside.
In a mixing bowl, combine: Spinach, Dill, Feta, Black pepper. Mix well.
In another bowl: Add eggs and a pinch of salt. Whisk well. Add milk, soda water, and melted butter. Whisk to combine.
In a well-oiled baking pan: Place half of the sliced phyllo. Pour over half of the egg mixture. Add the spinach mixture. Top with the remaining phyllo. Pour over the rest of the egg mixture.
Bake for 40–50 minutes, until golden and crispy.
