Gefilte Fish Pate

Name: Gefilte Fish Pate
Ingredients: 3 tablespoons vegetable oil; 4 medium sweet onions (about 2 pounds), peeled and chopped; 1 1/2 pounds whitefish fillet, bones removed, finely ground; 1 1/2 pounds pike fillet, bones removed, finely ground; 4 large eggs; 2 cups cold water; 6 tablespoons matzah meal; 1 tablespoon coarse salt; 2 teaspoons freshly ground white pepper; 2 tablespoons sugar; 2 large carrots, peeled and grated; Fresh flat-leaf parsley, for garnish; Red horseradish, for serving; White horseradish, for serving