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The first time I hurried these potatoes into the dressing while they were still warm, the creamy mixture turned thin and the pieces started to break apart. Letting them cool completely changed the whole bowl. This Christmas fish salad brings chilled salmon together with tender red potatoes, peas, crisp vegetables, capers, and a lemony Dijon dressing.

I bake the salmon and cook the potatoes separately, then give both time to get cold before they meet the dressing. That small pause keeps the salad creamy instead of slick, and it makes it much easier to fold in the salmon without turning it into shreds. After an hour in the refrigerator, the dill and capers have settled into the dressing, while the vegetables still bring a little crunch to each forkful.

Why Warm Potatoes Make This Creamy Salad Go Loose

Warm potatoes can be useful in some dressed salads, but they work against the texture I want here. They take up dressing quickly, and their heat loosens the mayonnaise and sour cream before the other ingredients are folded in. The result can feel heavy and slick rather than cool and creamy.

Cooling the potatoes all the way through gives the dressing a chance to cling to their surfaces instead of disappearing into the warm centers. It also helps the quartered pieces stay intact when you toss them with the celery, pepper, peas, and green onions. The timing matters: a short rest after draining lets excess heat escape, but the refrigerator is what brings the potatoes fully cold. Don’t rush that part just because the outside of a potato feels cool; the centers need to be cold, too. Then the salad holds its shape and the dressing stays distinct around each bite.

What Gives This Fish Salad Its Briny, Fresh Balance

• Skinless salmon — A boneless, skinless fillet is easy to bake and break into broad, tender flakes. Even thickness helps it cook at a similar pace from end to end; if one end is much thinner, watch that side as it bakes. Frozen fillets work once fully thawed.
• Red potatoes — Their waxy texture helps the quarters keep their shape after simmering and tossing. Small Yukon Gold potatoes are a practical substitute; they’ll be a little creamier, so handle them gently once cooked. Cut the pieces evenly so they become fork-tender together.
• Peas, celery, and red bell pepper — These bring a sweet pop and crisp bite against the soft potato and salmon. Thaw the peas before tossing them in; excess ice can water down the dressing. Finely diced celery and pepper spread their crunch through the bowl instead of landing in oversized bites.
• Capers and fresh dill — Capers give the salad a salty, briny edge, while fresh dill keeps the fish and creamy dressing tasting bright. Drain the capers well so their brine doesn’t thin the dressing. Fresh dill has a cleaner, more delicate aroma than dried, so it’s worth choosing a bunch with fragrant, green sprigs.
• Mayonnaise, sour cream, Dijon, and lemon — Mayonnaise gives the dressing body, sour cream adds tang, and Dijon and lemon keep it from tasting flat. A good-quality mayonnaise is noticeable in a simple dressing, but any familiar brand works. For a dairy-free bowl, use vegan mayonnaise and unsweetened dairy-free sour cream in place of their dairy counterparts.

Getting the Salmon and Potatoes Cold Before They Meet

Bake the salmon until just cooked through

Heat the oven to 400°F and line a rimmed baking sheet with parchment. Set the skinless salmon on the sheet, rub it with olive oil, and sprinkle it with black pepper. Bake for 12–16 minutes, checking the thickest part for 145°F; a thin fillet will finish sooner than a thick center-cut piece. Transfer the salmon to a plate and refrigerate it until cold before flaking.

Simmer the potatoes without letting them fall apart

Put the quartered red potatoes in a 3-quart saucepan and cover them with cold water by 1 inch. Bring the water to a boil, then lower the heat and simmer for 10–15 minutes. Start checking with a fork near the early end of that range: it should slide into a piece without the potato crumbling. Drain the potatoes, cool them for 15 minutes, then refrigerate until cold.

Whisk a dressing that coats instead of pools

In a 5-quart serving bowl, whisk the mayonnaise, sour cream, Dijon mustard, lemon juice, and kosher salt until smooth. Scrape around the bottom and sides of the bowl so no streaks of sour cream or mustard remain. The finished dressing should look cohesive, with the lemon and mustard mixed evenly through the creamy base. Whisk it directly in the bowl you’ll use for the salad to save a dish.

Fold the vegetables and salmon in gently

Add the cold potatoes, thawed peas, diced celery, diced red bell pepper, sliced green onions, drained capers, and chopped dill to the dressing. Toss gently until the vegetables and potatoes are coated. Flake the chilled salmon into large pieces, then fold it through with just a few careful turns. Refrigerate the finished salad for at least 1 hour before serving so the flavors can settle together.

Three Simple Ways to Adapt the Salad

Questions That Come Up When Making Christmas Fish Salad

Christmas Fish Salad

Christmas fish salad combines chilled flakes of salmon, tender red potatoes, peas, and crisp vegetables in a creamy Dijon dressing. Make it ahead and refrigerate for at least 1 hour so the flavors come together before serving.

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Prep Time 20 minutes mins

Cook Time 31 minutes mins

Chilling 1 hour hr 15 minutes mins

Total Time 2 hours hrs 6 minutes mins

Servings: 6 servings

Course: Side Dish

Cuisine: American

Calories: 480

Ingredients Equipment Method Notes

Ingredients

  

For the salmon

• 1.5 lb salmon fillet skinless
• 1 tbsp olive oil
• 0.25 tsp black pepper freshly ground

For the salad

• 1.5 lb red potatoes small, quartered
• 1 cup frozen peas thawed
• 2 celery ribs, finely diced
• 1 red bell pepper seeded and diced
• 3 green onions thinly sliced
• 2 tbsp capers drained
• 2 tbsp dill chopped fresh

For the dressing

• 0.5 cup mayonnaise
• 0.25 cup sour cream
• 1 tbsp Dijon mustard
• 2 tbsp lemon juice fresh
• 0.5 tsp kosher salt

Equipment

• 1 rimmed baking sheet
• 1 5-quart serving bowl

Method

 

Bake the salmon

1. Heat the oven to 400°F and line a rimmed baking sheet with parchment.
2. Set the salmon on the sheet, rub with olive oil, and sprinkle with black pepper.
3. Bake for 12–16 minutes, until the thickest part registers 145°F.
4. Transfer the salmon to a plate and refrigerate until cold.

Cook the potatoes

1. Put the potatoes in a 3-quart saucepan and cover with cold water by 1 inch.
2. Bring to a boil, then simmer for 10–15 minutes, until fork-tender.
3. Drain the potatoes, cool for 15 minutes, and refrigerate until cold.

Make the dressing

1. In a 5-quart serving bowl, whisk together the mayonnaise, sour cream, Dijon mustard, lemon juice, and kosher salt.

Assemble the salad

1. Add the cold potatoes, peas, celery, bell pepper, green onions, capers, and dill to the dressing and toss gently.
2. Flake the chilled salmon into large pieces and fold it into the salad.
3. Refrigerate for at least 1 hour before serving.

Notes

For the best texture, fold the chilled salmon in gently so it stays in large pieces. Refrigerate leftovers in an airtight container for up to 2 days; freezing is not recommended. For a dairy-free option, use dairy-free sour cream.