Mix eggs, sugar, milk, flour, and nutmeg in a medium bowl. Pour filling over rhubarb mixture slowly until it reaches crust top. Evenly distribute chopped butter over stuffing. Lightly tap and shake the baking sheet to remove air bubbles.
Warm strawberry jam and water in a small bowl in the microwave for 15 seconds. Let the pie cool after glazing it with jam. Keep chilled until serving.