Saucy Salmon, Fennel and Potato Gratin Dauphinoise

I’ll never forget the first time I made a gratin dauphinoise. It was a cold winter evening, and the creamy, comforting aroma filled my tiny apartment, transporting me back to my grandmother’s kitchen. The bubbling potatoes, infused with garlic and thyme, were pure magic. Since then, I’ve played with countless variations, but this Saucy Salmon, Fennel, and Potato Gratin Dauphinoise remains a firm favorite. The delicate salmon nestled amongst the layers of thinly sliced potatoes and fragrant fennel is a symphony of flavors and textures – a true celebration of simple ingredients.

Recipe Overview

• Prep Time: 30 minutes
• Cook Time: 60-90 minutes
• Total Time: 1 hour 30 minutes – 2 hours
• Servings: 6
• Dietary Type: Pescatarian

Ingredients

• 2 lbs fresh salmon, skinned, boned, and filleted
• 1 fennel bulb, cleaned, trimmed & cut into very thin slices
• 1-2 onions, peeled and sliced thinly
• 4-5 lbs potatoes, peeled and sliced VERY thinly
• 1 ounce butter
• ½ pint liquid crème fraîche (or ½ pint milk and cream mixture)
• Salt
• Black pepper
• Fresh lemon wedge (to garnish)
• Green fennel leaves (to garnish)
• 1-2 garlic cloves (optional)

Equipment Needed

• Large, oval or rectangular oven dish (gratin dish)
• Sharp knife or mandoline for slicing vegetables
• Cutting board

Instructions

1. Preheat your oven to 180°C/350°F. This ensures the gratin cooks evenly and the potatoes become tender.

2. Grease a large, preferably oval or rectangular oven dish (a gratin dish) with half of the butter. This prevents the gratin from sticking and adds a lovely richness to the bottom layer.

3. Layer half of the potatoes on the bottom of the dish, creating a slightly overlapping base. Then, arrange half of the fennel slices and half of the onion slices over the top of the potatoes.

4. Season this first layer generously with black pepper and salt to taste. Don’t be shy with the seasoning; it’s essential for bringing out the flavors of the vegetables.

5. Carefully lay the salmon fillets over the top of the seasoned vegetable layer. Ensure they are evenly spaced and will be cooked by the cream.

6. Continue layering with the remaining onion, fennel, and potato slices in that order, ending with a final layer of potatoes on top. Overlap the potato slices slightly for a beautiful presentation and even cooking.

7. Dot the top of the gratin with the remaining butter, distributing it evenly across the surface. This will help the potatoes brown beautifully and add another layer of flavor.

8. Pour the crème fraîche (or milk/cream mixture) over the top of the gratin, ensuring it seeps down between all the layers. The liquid should almost reach the top layer of potatoes.

9. Season the top generously with black pepper and salt.

10. Bake in the preheated oven for 1 to 1 ½ hours, or until the top is golden brown and the potatoes are soft when tested with a fork. If the top is browning too quickly, cover the dish loosely with foil for the last 30 minutes of cooking.

11. Remove from the oven and let rest for 10-15 minutes before serving. This allows the gratin to set slightly and the flavors to meld together.

12. Serve hot, garnished with fresh lemon wedges and the green fennel leaves. Crusty bread and a fresh salad make excellent accompaniments.

Expert Tips & Tricks

• Thinly Sliced Potatoes are Key: Use a mandoline or a very sharp knife to slice the potatoes as thinly as possible. This ensures they cook evenly and become meltingly tender. If the slices are too thick, they may remain firm and undercooked.

• Don’t Overcrowd the Dish: Avoid overcrowding the gratin dish. If necessary, use two smaller dishes instead of trying to cram everything into one. Overcrowding can lead to uneven cooking.

• Infuse the Cream: For an extra layer of flavor, infuse the crème fraîche (or milk/cream mixture) with a clove or two of crushed garlic and a few sprigs of fresh thyme before pouring it over the gratin. Remove the garlic and thyme before pouring.

• Make-Ahead Option: The gratin can be assembled ahead of time, up to 24 hours in advance. Cover it tightly with plastic wrap and refrigerate. Add about 15-20 minutes to the cooking time if baking straight from the refrigerator.

• Checking for Doneness: To ensure the potatoes are cooked through, insert a fork or knife into the center of the gratin. It should slide in easily with no resistance.

Serving & Storage Suggestions

Serve the Saucy Salmon, Fennel, and Potato Gratin Dauphinoise hot, directly from the oven. Garnish with fresh lemon wedges and the fronds of the fennel bulb for a burst of freshness. This dish pairs beautifully with a crisp green salad and crusty bread for soaking up the creamy sauce.

Leftovers can be stored in an airtight container in the refrigerator for up to 3 days. To reheat, cover the gratin with foil and bake in a preheated oven at 175°C/350°F until heated through. You can also reheat individual portions in the microwave.

While freezing is not recommended due to the potential for texture changes in the potatoes and cream, it is possible. Wrap the cooled gratin tightly in plastic wrap and then aluminum foil. Freeze for up to 1 month. Thaw completely in the refrigerator before reheating.

Nutritional Information

Nutrient	Amount per Serving	% Daily Value
Calories	599 kcal	N/A
Total Fat	24 g	37%
Saturated Fat	13 g	62%
Cholesterol	143 mg	47%
Sodium	183 mg	7%
Total Carbohydrate	59 g	19%
Dietary Fiber	8 g	32%
Sugars	3 g	N/A
Protein	38 g	75%

Variations & Substitutions

• Smoked Salmon: Substitute fresh salmon with smoked salmon for a bolder flavor. Add the smoked salmon towards the end of the cooking time to prevent it from becoming too dry.

• Vegetarian Option: Omit the salmon altogether and add another layer of vegetables such as sliced zucchini, bell peppers, or mushrooms.

• Dairy-Free: Use a plant-based cream alternative such as oat cream or cashew cream instead of crème fraîche. Be sure to choose an unsweetened variety.

• Garlic Lovers: As the original recipe suggests, add 1-2 cloves of minced garlic to the fennel and onion mixture for a more pronounced garlic flavor.

• Herb Variations: Experiment with different herbs such as thyme, rosemary, or sage to enhance the flavor of the gratin. Add the herbs along with the salt and pepper.

FAQs (Frequently Asked Questions)

Q: Can I use a different type of potato for this recipe?
A: Yukon Gold or Russet potatoes work best for gratin dauphinoise due to their starch content, which helps to thicken the sauce. However, you can experiment with other varieties, keeping in mind that they may affect the texture of the final dish.

Q: How do I prevent the potatoes from sticking to the bottom of the dish?
A: Thoroughly greasing the baking dish with butter is essential to prevent sticking. You can also add a thin layer of breadcrumbs to the bottom of the dish before adding the potatoes.

Q: Can I add cheese to this gratin?
A: While traditional gratin dauphinoise doesn’t include cheese, you can certainly add a layer of grated Gruyère or Parmesan cheese on top for a richer flavor.

Q: How do I know when the salmon is cooked through?
A: The salmon is cooked through when it flakes easily with a fork and is no longer translucent in the center.

Q: Can I use frozen salmon for this recipe?
A: Yes, you can use frozen salmon, but be sure to thaw it completely before adding it to the gratin. Pat the salmon dry with paper towels to remove any excess moisture.

Final Thoughts

I truly hope you’ll try this Saucy Salmon, Fennel and Potato Gratin Dauphinoise. It’s a dish that’s both comforting and elegant, perfect for a cozy weeknight dinner or a special occasion. The combination of creamy potatoes, fragrant fennel, and delicate salmon is simply divine. Don’t be afraid to experiment with different herbs and spices to make it your own. Serve with a chilled glass of white wine and enjoy! And please, let me know what you think – I love hearing your feedback and seeing your creations!