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In a large bowl, add the eggs, dill, seltzer, sugar, and salt and pepper and whisk until combined. Add the matzo meal and the chicken fat/chive mixture and stir to combine. Cover well and refrigerate for at least 8 hours and up to 24 hours.
Bring a large pot of salted water to a boil over medium heat. Form the matzo mixture into 8 equal size balls, about 1 3/4 ounces each, add to the water, reduce the heat to simmer, cover and cook until very tender, about 1 hour and 20 minutes. Remove with a slotted spoon to the pot with the chicken stock and cook for 5 minutes before serving. Ladle the soup into individual bowls and serve.
For the chicken stock:
Combine all ingredients in a large stockpot and add enough cold water to cover by 2-inches. Bring to a boil, over medium heat, then reduce the heat to low and simmer, skimming the scum from the stock with a ladle, every 15 minutes, for 3 hours. Strain into a large bowl and discard the solids.