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–+ servings
A fish pie casserole and a spatula.
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4.97 from 27 votes

Low Carb Keto Fish Pie

Comfort food at its best - a deliciously creamy keto fish pie with cauliflower mash topping that will make you come back for seconds!
Prep Time20 minutes
Cook Time40 minutes
Total Time1 hour
Course: Main Course
Cuisine: British
Servings: 6
Calories: 347kcal
Author: Katrin Nürnberger

Ingredients

For the filling

  • 1 onion chopped
  • 2 garlic cloves chopped
  • 1 cup dry white wine (250ml)
  • 1 cup double/heavy cream (250ml)
  • 3 medium zucchini 550g, grated
  • grated lemon zest from 1 unwaxed lemon
  • handful of fresh parsley and chives chopped
  • 1.75 lb hake and/or cod fillets (800g) without skins
  • pepper and salt to taste

For the cauliflower mash

  • 1 very large or 2 smaller cauliflower heads 700g
  • 3 tablespoon melted butter 40g
  • ½ cup soured cream or cream cheese, (125g)
  • 1 cup cheddar shredded (125g)
  • 1 tablespoon chopped chives
  • ¼ teaspoon nutmeg
  • salt to taste

Instructions

Cauliflower Mash

  • Separate the cauliflower into florets and steam/ boil/ microwave until soft. Follow the tips in my keto mashed cauliflower recipe.
  • Add the butter, soured cream, cheddar, chives, nutmeg and salt. Blend in a food processor or with an immersion blender until smooth.
  • Preheat oven to 200 Celsius/400 Fahrenheit (electric) or 180C / 360 F fan.

Fish filling

  • Fry the onions and garlic in olive oil over a low / medium until soft and translucent, around 3 minutes. Do to burn.
  • Add the white wine. Turn up the heat to high and reduce by half.
  • Add the grated courgettes, cream, lemon zest and herbs and simmer for 5 minutes. Season with salt and pepper.

Assembly

  • Put the fish fillets in a casserole dish and pour over the sauce.
  • Spread the cauliflower mash on top and run a fork over the top to make lines.
  • Bake in the oven for 40 minutes or until the top is browned.
  • Sprinkle with some fresh parsley and serve.

Notes

8.1g net carbs per serve. Makes 6 servings. 
Option to layer 2 sliced hard boiled eggs over the fish filling. 
You can use a mix of white fish or even salmon and add prawns. All work well. Adding celery and fennel to the sauce taste good, too.
Don't miss out on the lemon zest. It really makes the recipe!!
If you do not want to use wine, substitute with a good quality fish stock or even chicken broth.

Nutrition

Calories: 347kcal | Total Carbohydrates: 11.4g | Protein: 29.3g | Fat: 16.8g | Fiber: 3.3g | Sugar: 5.6g