Quick Recipe Version (TL;DR)
Quick Ingredients
- 12 oz smoked whitefish fillet, skin and bones removed
- 1/3 cup mayonnaise
- 3 tbsp sour cream
- 1 tbsp fresh lemon juice
- 1 tsp Dijon mustard
- 2 tbsp finely minced red onion
- 2 tbsp finely chopped celery
- 1 tbsp chopped capers (optional)
- 1–2 tbsp chopped fresh dill
- 1/4 tsp kosher salt, 1/4 tsp black pepper (to taste)
- 4 sesame bagels, split
- 1/2 small red onion, very thinly sliced into rings
- 1 small Persian cucumber (or 1/3 English cucumber), thinly sliced
Do This
- 1. Flake smoked whitefish into bite-size pieces, discarding skin and bones.
- 2. In a bowl, whisk mayo, sour cream, lemon juice, Dijon, salt, and pepper.
- 3. Fold in minced red onion, celery, capers, dill, then gently fold in whitefish.
- 4. Taste and adjust seasoning; chill 10 minutes if you have time.
- 5. Toast bagels until golden (about 3–5 minutes in toaster or at 375°F / 190°C in oven).
- 6. Generously spread whitefish salad on warm bagel bottoms.
- 7. Top with cucumber slices and red onion rings, close bagels, and serve immediately.
Why You’ll Love This Recipe
- All the flavor of a classic Jewish deli whitefish salad, made easily at home.
- Creamy, smoky, and rich, perfectly balanced with crisp cucumber and sharp red onion.
- Comes together in under 30 minutes with no cooking besides toasting the bagels.
- Perfect for brunch, a light dinner, or make-ahead lunches that feel restaurant-worthy.
Grocery List
- Produce: 1 small red onion, 1 small Persian cucumber (or 1/3 English cucumber), 1 lemon, fresh dill, 1 small stalk celery
- Dairy: Mayonnaise, sour cream, unsalted butter (optional, for toasting)
- Pantry: Smoked whitefish fillet (from deli/seafood counter), Dijon mustard, capers, sesame bagels, kosher salt, black pepper
Full Ingredients
For the Smoked Whitefish Salad
- 12 oz smoked whitefish fillet, skin and bones removed, flaked into bite-size pieces (about 2 cups loosely packed)
- 1/3 cup mayonnaise
- 3 tbsp sour cream
- 1 tbsp freshly squeezed lemon juice
- 1 tsp Dijon mustard
- 2 tbsp finely minced red onion
- 2 tbsp finely chopped celery (from 1 small stalk)
- 1 tbsp capers, drained and finely chopped (optional but classic)
- 1–2 tbsp finely chopped fresh dill (to taste)
- 1/4 tsp kosher salt, or to taste (smoked fish is salty; start small)
- 1/4 tsp freshly ground black pepper, or to taste
For Assembling the Bagels
- 4 sesame bagels, horizontally sliced
- 2 tbsp unsalted butter, softened, or 2 tbsp olive oil (optional, for toasting in a pan)
- 1/2 small red onion, very thinly sliced into rings (about 1/2 cup)
- 1 small Persian cucumber, or 1/3 English cucumber, very thinly sliced into rounds (about 3/4 cup)
Optional Garnishes
- Extra fresh dill sprigs
- Lemon wedges
- Additional capers
Step-by-Step Instructions
Step 1: Prep the smoked whitefish
Place the smoked whitefish fillet on a cutting board. Using clean fingers or a fork, gently pull the flesh away from the skin, feeling carefully for any pin bones and removing them as you go. Flake the fish into small, bite-size pieces, roughly 1–2 cm each. Avoid shredding it too finely; you want tender, visible flakes in the finished salad. Discard the skin and bones. Transfer the flaked fish to a medium mixing bowl and set aside.
Step 2: Make the creamy dressing
In a separate medium bowl, whisk together the mayonnaise, sour cream, lemon juice, and Dijon mustard until smooth and fully combined. Add the kosher salt and black pepper, starting with the amounts listed. You can always add more seasoning after you taste the finished salad, but it is harder to correct if it becomes too salty, especially with smoked fish.
Step 3: Add aromatics and herbs
To the bowl with the dressing, add the finely minced red onion, chopped celery, chopped capers (if using), and chopped fresh dill. Stir to distribute everything evenly. These ingredients add crunch, brightness, and that classic deli character, so make sure they are finely chopped for a pleasant, even texture in every bite.
Step 4: Fold in the smoked whitefish
Scrape the dressing mixture over the bowl of flaked smoked whitefish. Using a spatula or large spoon, gently fold the fish into the dressing. Take your time and use a light hand so the fish stays in nice, distinct chunks instead of turning pasty. Taste a small spoonful. Adjust with a little more salt, pepper, lemon juice, or dill to suit your preferences. If possible, cover and refrigerate for at least 10 minutes to let the flavors meld while you prepare the bagels and toppings.
Step 5: Toast the sesame bagels
Slice the sesame bagels in half horizontally if they are not already split. For a simple toast, place them in a toaster and toast on medium until golden brown, about 3–5 minutes. For an extra-delicious, deli-style toast, heat a large skillet over medium heat. Spread the cut sides of each bagel lightly with softened butter or brush with a bit of olive oil. Place cut-side down in the skillet and toast until golden and crisp, 3–4 minutes. You can also toast on a baking sheet, cut-side up, in a preheated 375°F (190°C) oven for 5–7 minutes.
Step 6: Prepare the toppings
While the bagels toast, thinly slice the red onion into delicate rings and the cucumber into thin rounds. Pat the cucumber slices dry with a paper towel if they seem very wet; this helps keep the bagels from getting soggy. Set aside a few dill sprigs and lemon wedges if you plan to use them as garnishes. Have everything within easy reach for quick assembly.
Step 7: Assemble the smoked whitefish salad bagels
Place the toasted bagel bottoms on plates or a serving board. Generously spoon the smoked whitefish salad onto each bottom half, dividing it evenly among the 4 bagels. Aim for a thick, luxurious layer. Top each with a fan of cucumber slices and a few rings of red onion for crunch and sharpness. Add a small dill sprig on top if desired. Close with the bagel tops. Serve immediately with lemon wedges on the side for squeezing over the filling if you like an extra hit of brightness.
Pro Tips
- Let the whitefish salad chill for 30 minutes if you have time; the flavors deepen and meld beautifully.
- Taste the smoked fish before adding salt. Some whitefish is very salty and may need almost no added salt.
- Slice the red onion as thinly as possible; paper-thin slices give flavor without overpowering the salad.
- If your whitefish is very oily, gently blot it with a paper towel before flaking to keep the salad from feeling heavy.
- For entertaining, serve the salad in a shallow bowl on a platter surrounded by sliced bagels, cucumber, and onion so guests can build their own.
Variations
- Extra-smoky version: Add 1–2 drops of liquid smoke or a small pinch of smoked paprika to the dressing for a deeper smoky note (use sparingly).
- Lighter, yogurt-based salad: Replace half of the mayonnaise with plain Greek yogurt and add an extra teaspoon of lemon juice for a tangier, lighter spread.
- Open-faced brunch platter: Skip the top bagel half and serve the salad open-faced, topped with cucumber, onion, extra capers, and dill for a more elegant brunch presentation.
Storage & Make-Ahead
Store the smoked whitefish salad in an airtight container in the refrigerator for up to 3 days. The flavor often improves after the first day as the ingredients marry, but the texture is best within 48 hours. Stir gently before serving. Do not freeze, as the creamy dressing and fish texture do not hold up well. You can prep the red onion and cucumber up to 1 day ahead and store them separately in airtight containers in the fridge. For the best texture, slice and toast the bagels just before serving so they stay crisp and do not become soggy from the salad.
Nutrition (per serving)
Approximate values per assembled bagel sandwich (1 of 4): about 500 calories; 23 g protein; 20 g fat; 55 g carbohydrates; 3 g fiber; 7 g sugar; 900–1100 mg sodium (exact values will vary based on the brand of smoked whitefish, bagels, and mayonnaise used).
