Tarts Free recipe

Caramelized Onion and Gruyere Tart

Slow-cooked sweet onions and nutty Gruyere cheese in a buttery shortcrust shell -- a classic bistro favourite that pairs brilliantly with a crisp lager.

Time
75 min
Servings
6
Level
Medium
Rating
4.8 ★★★★★
Caramelized Onion and Gruyere Tart step 1
Caramelized Onion and Gruyere Tart step 2
Caramelized Onion and Gruyere Tart step 3

in the kitchen

Ingredients

  • 320g ready-rolled shortcrust pastry
  • 4 large white onions, thinly sliced
  • 2 tbsp unsalted butter
  • 1 tbsp olive oil
  • 150g Gruyere cheese, grated
  • 3 large eggs
  • 200ml double cream
  • Salt, pepper, and fresh thyme

Method

  1. Preheat oven to 180C. Line a 23cm tart tin with the pastry, prick the base, and blind bake for 15 minutes until pale gold.
  2. Melt butter with olive oil in a wide pan over low heat. Add onions and a pinch of salt. Cook, stirring occasionally, for 40 minutes until deeply caramelised.
  3. Whisk eggs and cream together in a bowl. Season well with salt and pepper. Spread onions over the tart base, scatter over the Gruyere, then pour the egg mixture on top.
  4. Bake at 180C for 25-30 minutes until the filling is just set and golden. Rest for 10 minutes before slicing. Scatter with fresh thyme to serve.