1. Defrost gefilte fish and spinach in refrigerator. Preheat oven to 375.
2. Place each loaf of softened fish in its own medium mixing bowl. Boil or steam carrots until soft.
3. drain off water and set aside to cool. Process carrots in a food processor until lightly chopped and combine well with one loaf of fish.
4. drain off water and set aside to cool. Process carrots in a food processor until lightly chopped and combine well with one loaf of fish.
5. Spray two glass loaf pans, 5"x9", with cooking spray. Layer spinach mixture at the bottom of each pan.
6. Pat gently to flatten the mixture evenly. add second mixture (plain loaf) on top of the spinach mixture and pat gently to flatten.
7. Layer carrot mixture on top of plain mixture and smooth evenly. Cut a piece of wax paper and lay directly on top of fish, to prevent burning.
8. Bake at 375 for 1-1/2 hours.
9. Remove from oven and let cool. Chill overnight.
10. Remove gefilte fish from loaf pans. Trim off baked edges
11. Turn each loaf on its side and slice thickly, so the colors do not mix together.

Source: "Kosher Delicious," from the Maimonides Academy, Los Angeles