Savory Crepes (Meat and Mushroom Nalesniki)

Bahan-bahan (6 porsi)

• ½ cup lukewarm water
• 1 cup milk
• 4 large eggs
• 4 tbsp unsalted butter (melted. + more to saute.)
• 1 cup all-purpose flour (or use 1/2 cup whole wheat flour and 1/2 cup all-purpose)
• 1/4 tsp salt
• 1 lb to 1.25 lbs ground Pork
• 3/4 to 1 lb mushrooms (sliced)
• 3 hard boiled eggs
• Salt and Pepper
• 1 tbsp real mayonnaise OR 1 tbsp water
• 1 small/medium onion (finely chopped)