Brioche-Crusted Brassica Gratin with Bright Salad

Brioche-Crusted Brassica Gratin with Bright Salad

A comforting yet refined main course featuring tender broccoli and cauliflower enrobed in a sharp cheddar Mornay sauce. The dish is topped with cubes of buttery brioche that bake into a golden, crisp crust, contrasting perfectly with a cold, tangy side salad of crisp lettuce to cut through the richness.

1hIntermediate4 servings

Equipment

Large pot
Colander
Medium saucepan
Whisk
Baking dish (approx 20x30cm)
Small mixing bowl
Chef's knife
Cutting board

Ingredients

4 servings

Vegetable Base

  • 300 g broccoli florets, cut into bite-sized pieces
  • 300 g cauliflower florets, cut into bite-sized pieces
  • 2000 ml water
  • 15 g salt

Mornay Sauce

  • 45 g unsalted butter
  • 45 g all-purpose flour
  • 500 ml whole milk, warmed
  • 150 g sharp white cheddar cheese, freshly grated
  • 10 g dijon mustard
  • 1 g nutmeg, ground
  • 2 g black pepper, freshly cracked

Brioche Topping

  • 150 g brioche loaf, cut into 2cm cubes
  • 20 g unsalted butter, melted

Salad & Tangy Dressing

  • 2 gem lettuce heads
  • 45 ml extra virgin olive oil
  • 15 ml apple cider vinegar
  • 10 ml lemon juice
  • 10 g wholegrain mustard
  • 5 g honey

Nutrition (per serving)

687
Calories
21g
Protein
39g
Carbs
47g
Fat
6g
Fiber
13g
Sugar
2084mg
Sodium

Method

01

Preheat your oven to 200°C (400°F). Bring a large pot of salted water to a rolling boil.

02

Blanch the broccoli and cauliflower florets in the boiling water for 3-4 minutes until vividly bright and slightly tender, but still firm (al dente). Drain thoroughly in a colander.

4mLook for: Bright vivid colorFeel: Knife pierces with slight resistance
03

In a medium saucepan over medium heat, melt the 45g of butter. Whisk in the flour and cook for 2 minutes until bubbly and pale (blonde roux) to cook out the raw flour taste.

2m
04

Gradually whisk in the warmed milk, a splash at a time, ensuring the mixture is smooth before adding more. Simmer gently for 5 minutes until thickened.

5mLook for: Coats the back of a spoon (nappe consistency)
05

Remove the sauce from heat. Stir in the grated cheddar, Dijon mustard, nutmeg, and black pepper until the cheese is fully melted and the sauce is glossy. Taste and adjust salt if needed.

06

Combine the drained vegetables and cheese sauce in the baking dish, tossing gently to coat. Scatter the cubed brioche over the top. Drizzle the brioche with the 20g of melted butter.

07

Bake on the middle rack for 20-25 minutes, until the sauce is bubbling at the edges and the brioche topping is deep golden brown and crisp.

25mLook for: Golden brown crust, bubbling sauce
08

While the bake finishes, whisk together the olive oil, apple cider vinegar, lemon juice, wholegrain mustard, and honey in a small bowl to make the dressing. Just before serving, toss the lettuce leaves with the dressing.

09

Serve the hot bake immediately with the cold, dressed salad on the side.

Chef's Notes

  • Dry your vegetables thoroughly after blanching. Excess water trapped in the broccoli florets will water down your cheese sauce.
  • If your brioche is very fresh, leave the cubes on a tray on the counter for an hour to dry out, or toast them in the oven for 5 minutes before assembling. This ensures a crunchier topping.
  • For the dressing, the high acidity is intentional. It acts as a palate cleanser to cut through the heavy fats of the cheese and brioche.
  • Use block cheese and grate it yourself. Pre-grated cheese contains starch/cellulose preventing it from melting smoothly.

Storage

Refrigerator: 3 daysStore salad and bake separately. Brioche topping may lose crispness; reheat in oven to restore texture.

Freezer: 1 monthBake freezes well without the salad. Thaw overnight before reheating.

Reheating: Reheat bake in a 180°C oven for 15-20 minutes until heated through. Do not microwave if possible to preserve brioche texture.

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