ingredients

• 2 stalks celery
• 2 carrots
• 2 garlic cloves
• 3 tablespoons olive oil
• 1 cup milk
• 1 10-ounce box frozen chopped spinach, thawed and squeezed
• 1/2 cup peas
• 1/2 cup grated Parmesan
• 3 eggs
• 1/2 cup chopped parsley
• 2 tablespoons Dijon mustard
• 1 teaspoon salt
• 12 ounces flaked halibut
• 2-pound package refrigerated prepared mashed potatoes (such as Diner’s Choice)
• 2 scallions, sliced

Source: http://www.tastebook.com/recipes/1999598-Fish-Pie