In a medium frying pan over medium-high heat, melt butter. Cook the bacon until crispy, about 6 minutes. Transfer bacon to a plate lined with paper towels. Drain grease from pan. Cook sliced onion in pan until caramelized, about 6 minutes. Transfer to a small bowl; set aside.
In a large saucepan over medium heat, bring 6 quarts of water to a boil.
In a large bowl, combine grated onion, potatoes, flour, baking soda, eggs, salt and pepper into a thick dough.
Drop teaspoon-sized balls of dough into the boiling water. Cook each dumpling until it floats and is cooked through, about 3 minutes. Using a slotted spoon, transfer cooked dumplings to a serving plate.
Top a portion of dumplings with bacon, caramelized onions and sour cream.
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