Heat oil in a skillet over medium heat. Add onions and sauté until soft. Add frozen spinach and spices, to taste. Cook for 2-3 minutes. remove from heat.

Drain the excess liquid. In a large bowl, combine spinach mixture with defrosted gefilte fish.

Spread gefilte fish mixture over salmon. Roll salmon jelly-roll style. Freeze overnight.

Remove salmon from freezer and let thaw slightly. Preheat oven to 350 F ( 180 C). Grease a baking sheet.Cut salmon roll into 1/2 inch slices and place on prepared baking sheet. Bake for 25 minutes.

Serve with dill dip: 1 cup mayonnaise, 4 cubes frozen dill, 1 Tablespoon lemon juice, 1 clove garlic (crushed) , salt and pepper to taste. Blend.