Make the stock. Place everything in a saucepan, bring to boil.
1 small onion, 1 L water, non oily fishbones and/or fish head, 1 large carrot, 1 small onion, 1 tsp salt, 1 tsp sugar, 5 white peppercorns
Skim off any scum.
Simmer for 30 minutes, then strain, reserving the carrots, being careful not to break them up.
The fish balls
Pulse the fish a few times until the fish is finely chopped/minced, being careful not to turn it into a paste. Place in a large bowl.
500 g fish meat
Sprinkle the matzo meal, sugar, salt and pepper all over the fish and mix well with a wooden spoon.
40 g matzo meal, 1 tsp sugar, 1 tsp salt, 1 dash white pepper
Add the egg and mix thoroughly, binding it well. Finish it off with your hands lightly, no squeezing the paste.
1 egg
Cover with a cling film and leave to rest in the fridge for 30 minutes.
After 30 minutes, wet your hands and form the fish paste into oval shaped fish balls, slightly on the flat side, see pictures.
Place the fish stock in a large saucepan and bring to a gentle simmer. Lower the fish balls into the stock, cover and poach away for 30 minutes. Do it in two batches if you have to.
Take a large shallow serving dish and place the cooked fish balls in it.
Reduce the poaching stock by half and pour all over the fish balls.
Decorate each fish ball with a carrot and chill in the fridge overnight.
Notes
Traditionally served with chrain, a horseradish relish.Total time does not include chilling time overnight.