Cut the bread rolls into small cubes and pour warm milk over them. Let them soak for 10-15 minutes, allowing the bread to absorb the milk well. TIP: Don't soak them completely; they should be well-moistened but still able to hold their shape.
Blanch the spinach briefly (1-2 minutes), then drain it well and chop it finely. Finely chop the onion and sauté it in butter until translucent, then mix it with the spinach.
Add the spinach-onion mixture, eggs, salt, and pepper to the milk-soaked bread rolls. Mix by hand until just combined, but don't overwork the dough, or it will become tough. Let it rest for 10 minutes.
With wet hands, form approximately 6-8 equal-sized dumplings. The mixture should be easy to shape but not too sticky. TIP: If it's too wet, add a little breadcrumbs.
Bring a large pot of water to a boil, then reduce the heat so it's just simmering. Cook the dumplings for 15-20 minutes. Once they float to the surface, leave them in the water for another 5 minutes to ensure they are thoroughly cooked.
Remove the cooked knödel with a slotted spoon, then serve sprinkled with breadcrumbs fried in butter or grated cheese. Excellent as a vegetarian main course or a meat-free side dish.
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