Welsh smoked salmon and leek quiche

WELSH SMOKED SALMON & LEEK QUICHE WITH CAERPHILLY-CAULIFLOWER CRUST

Robert Meyers-Lussier

A cauliflower-and-Caerphilly crust holds a briny, leek-sweet custard packed with cold-smoked salmon, capers, dill, and lemon zest—rich enough to anchor a brunch table, bright enough to eat at room temperature.

PREP 25 MIN | COOK 65 MIN | SERVES 6–8

The Headnote

This quiche leans into Welsh character through some of the country’s most recognizable flavor cues: sweet leeks, creamy Caerphilly, and the savory warmth of mustard and thyme. Smoked salmon gives it a coastal feel, while dill, capers, lemon, and pickled onions bring brightness that keeps the custard lively rather than heavy. The cauliflower crust stays light but flavorful, with dry mustard and thyme baked in so it tastes intentional from the first bite. The result is rich, briny, leek-sweet, and distinctly brunch-ready, with a Welsh spirit rather than a Nordic one.

Ingredients

Caerphilly-Cauliflower Crust

• 3 cups cauliflower rice (fresh or thawed, squeezed bone-dry)
• ½ cup finely grated Caerphilly cheese
• 1 large egg
• ½ teaspoon dry mustard powder
• ¼ teaspoon dried thyme
• ½ teaspoon kosher salt
• ¼ teaspoon freshly ground black pepper
• Nonstick cooking spray

Mustard-Dill Custard

• 4 large eggs
• ¾ cup whole milk (or 2%)
• ¼ cup plain Greek yogurt (2% or whole)
• 1 tablespoon whole-grain mustard (or Dijon)
• ½ teaspoon kosher salt
• ¼ teaspoon freshly ground white pepper
• Pinch freshly grated nutmeg (or allspice if you have it)

Filling

• 4 oz cold-smoked salmon, torn into pieces
• 2 medium leeks (white and light green parts only), halved and thinly sliced
• 2 tablespoons butter or olive oil
• 2 tablespoons pickled red onions, roughly chopped, plus more for garnish
• 1 tablespoon capers, rinsed and lightly crushed
• 1 tablespoon fresh dill, roughly chopped, plus more for garnish
• 1 tablespoon fresh chives, snipped (if you have them)
• 1 teaspoon lemon zest
• ¼ teaspoon kosher salt

For Serving

• Additional pickled red onions

Method

1. Build the Caerphilly Crust

Heat the oven to 400°F. Squeeze the 3 cups cauliflower rice in a clean kitchen towel until completely dry. In a bowl, combine the dried cauliflower rice, ½ cup grated Caerphilly, 1 egg, ½ teaspoon dry mustard powder, ¼ teaspoon dried thyme, ½ teaspoon kosher salt, and ¼ teaspoon black pepper. Mix until the mixture holds together when pressed. Spray a 9-inch pie dish and press the mixture evenly across the bottom and up the sides. Bake for 20 to 22 minutes, until golden and firm. Cool slightly, then reduce the oven to 350°F.

2. Soften the Leeks

Melt 2 tablespoons butter or olive oil in a skillet over medium-low heat. Add the 2 medium leeks (white and light green parts only, halved and thinly sliced) and ¼ teaspoon kosher salt. Cook slowly for 12 to 15 minutes, stirring now and then, until the leeks are completely soft and just starting to turn golden at the edges. Stir in the 2 tablespoons chopped pickled red onions and let the mixture cool slightly.

3. Make the Mustard-Dill Custard

Whisk together 4 eggs, ¾ cup milk, ¼ cup Greek yogurt, and 1 tablespoon whole-grain mustard until smooth. Season with ½ teaspoon kosher salt, ¼ teaspoon white pepper, and a pinch of nutmeg. The custard should taste gently savory and lightly sharp, not aggressively mustardy.

4. Fill the Crust

Scatter the leek mixture across the baked crust. Arrange the 4 oz smoked salmon over the top, then add the 1 tablespoon capers, 3 tablespoons chopped dill, 1 tablespoon chives if using, and the 1 teaspoon lemon zest. Pour the custard slowly over everything, letting it settle into the gaps.

5. Bake Until Just Set

Bake at 350°F for 28 to 32 minutes, until the edges are set and the center still has a slight wobble. A knife inserted about 1 inch from the edge should come out clean. Rest the quiche for 10 minutes before slicing.

6. Serve

Slice into wedges and garnish with extra dill, pickled red onions, and a little black pepper. Serve warm or at room temperature with extra whole-grain mustard and lemon wedges on the side.

SERVE WITH

7. A simple green salad or cucumber salad with a light vinaigrette
8. Oatcakes, brown bread, or good toast
9. A spoonful of crème fraîche or sour cream with a touch of mustard stirred in
10. Sparkling water with lemon, dry cider, or hot tea

Chef’S Notes (Read Before You Cook)

• Prep and cook times are estimates. Prep (25 min) covers squeezing the cauliflower dry, slicing leeks, mixing the crust, and making the custard. Cook time (65 min) assumes the leek-softening step runs concurrently with the crust bake and cool cycle. Total time from oven-on to table is roughly 90 minutes.

NEW TO THESE INGREDIENTS AND TECHNIQUES?

If something in this recipe made you pause, here is what it is and why it is here.

Ingredients

Caerphilly. A crumbly, mildly tangy Welsh cow’s milk cheese. It brings gentle salt and richness to the crust without overwhelming it. Substitute with mild white cheddar or Monterey Jack; the flavor will be slightly less complex.

Cauliflower rice. Raw cauliflower pulsed in a food processor until it resembles rice grains. Available pre-made in most grocery stores. Squeezing it completely dry is the critical step—residual moisture prevents the crust from setting firm.

Cold-smoked salmon. Cured and smoked at low temperature, leaving the flesh silky and tender rather than cooked through. Lox is a close substitute. Hot-smoked salmon works but significantly changes the texture of the filling.

Capers. Pickled flower buds, briny and sharply acidic. They cut through the richness of the custard. Substitute with finely chopped green olives if unavailable.

Whole-grain mustard. Mustard made with whole seeds left intact, giving it a coarser texture than Dijon. Dijon works as a substitute but blends in completely rather than contributing texture.

Greek yogurt. Used in the custard in place of heavy cream. It adds tang and lightness without making the filling dense. Sour cream is a direct substitute.

Pickled red onions. Red onions cured in vinegar, sharp and brightly colored. They add acidity that keeps the custard from tasting flat. Available jarred, or easy to make at home with onion, vinegar, salt, and a pinch of sugar.

Techniques

Squeezing cauliflower dry. The single most important step for the crust. Excess moisture steams rather than bakes, preventing the crust from firming up. Wring it in a clean kitchen towel—twist hard—until no more liquid comes out.

Slow-cooking leeks. Leeks cooked over low heat for 12 to 15 minutes become sweet and yielding. Rushed over high heat, they turn limp and bitter. Barely golden edges are the visual cue that they are ready.

The wobble test. A properly set quiche custard has a slight jiggle at the center when gently shaken—similar to set gelatin. It firms completely as it rests. Overbaking drives off moisture and produces a rubbery, cracked custard.

Robert Meyers-Lussier