Sauce:
1 C vinegar
1 C water
1/2 C sugar
handful pickling spices (I put it in a mesh bag so the fish doesn’t get “dirty”)
10 oz ketchup
salt
Buy filleted salmon with no skin or bones. Boil for 10 minutes on the stove until just cooked (do not overcook). Cool. Slice onions and lay the salmon on top of the raw onions. Boil the sauce, pour on top of the fish, and let it marinate in the fridge before serving (the longer it marinates the better it tastes).
The fish should be completely covered in sauce. If you’re making a lot of fish, you’ll need to make more than one recipe of the sauce.