Brunch · French · Vegetarian ·

Hearty Swiss Raclette Tart with Onion Jam

Name: Hearty Swiss Raclette Tart with Onion Jam
Prep time: 35 min
Cook time: 105 min
Total time: 140 min
Yield: 6 servings
Cuisine: Brunch
Ingredients: 1 sheet of puff pastry, thawed; 1 egg, beaten, for egg wash; 3 large red onions, thinly sliced; 2 tbsp olive oil; 3 tbsp balsamic vinegar; 2 tbsp honey; Salt and pepper to taste; 200g raclette cheese, thinly sliced or grated; 2 tbsp fresh thyme leaves; 1/2 tsp freshly ground black pepper; Fresh thyme sprigs, optional

This delightful tart combines the rich, creamy flavor of raclette cheese with the sweet and tangy notes of caramelized onion jam, nested in a buttery puff pastry. Perfect for brunch or a comforting di

4.8(519 reviews)

·By Ethan Brooks·February 4, 2026

Hearty Swiss Raclette Tart with Onion Jam — Brunch served and photographed from above

Prep

35 min

Cook

1 h 45 min

Difficulty

Intermediate

Serves

Ingredients

Servings

For the Tart Shell

For the Onion Jam

For the Filling

For the Garnishing

Nutrition

Per serving

Calories: 318 kcal
Protein: 10.2 g
Carbs: 23.3 g
Fat: 21.3 g
Fiber: 1.8 g

Whole recipe

Total

Calories: 1908 kcal
Protein: 61 g
Carbs: 140 g
Fat: 128 g
Fiber: 11 g

Breakdown by ingredient▾

Ingredient	Cal	P	C	F	Fib
1 sheet of puff pastry, thawed	550	7	54	35	3
1 egg, beaten for egg wash	70	6	1	5	0
3 large red onions thinly sliced	150	3	36	0	6
2 tbsp olive oil	240	0	0	27	0
3 tbsp balsamic vinegar	42	0	10	0	0
2 tbsp honey	128	0	35	0	0
Salt and pepper to taste	0	0	0	0	0
200g raclette cheese thinly sliced or grated	720	45	2	61	0
2 tbsp fresh thyme leaves	5	0	1	0	1
1/2 tsp freshly ground black pepper	3	0	1	0	1
Fresh thyme sprigs optional	0	0	0	0	0

These nutrition estimates are approximate and not a substitute for professional dietary advice.

Preparation

Get these tasks done before you start cooking.

Preparing the Onion Jam

1
Heat oil
Heat olive oil in a large pan over medium heat.
2
Cook onions
Add onions and a pinch of salt, stirring occasionally, until soft and caramelized (about 20-25 minutes).
3
Add vinegar and honey
Stir in balsamic vinegar and honey, allowing to cook for another 5 minutes until thickened.

Preparing the Tart Shell

1
Preheat oven
Preheat oven to 200°C (390°F).
2
Prepare pastry
Roll out the puff pastry on a floured surface and carefully place it in a tart pan. Trim excess edges.
3
Blind bake prep
Prick the base with a fork and brush with egg wash.
Tip: Ensure there are no air bubbles beneath the puff pastry to keep it crisp. Chill the prepared tart shell in the freezer for 10 minutes before baking to prevent shrinking.

How to Make Hearty Swiss Raclette Tart with Onion Jam

Total time: 2 h 20 min · Yields 6 servings

1
Blind Bake Tart Base
Blind bake the pastry shell in the preheated oven for 15 minutes until lightly golden.
2
Assemble Tart
Spread the onion jam evenly over the baked tart shell, then layer with raclette cheese and sprinkle thyme leaves over the top.
3
Final Bake
Bake the assembled tart in the oven until the cheese is bubbly and golden (about 15-20 minutes).