French Onion Tart

Name: French Onion Tart
Prep time: 1 h
Cook time: 35 min
Total time: 1 h 35 min
Yield: 4 servings
Cuisine: Vegetarian
Ingredients: 1kg white onions, very thinly sliced; 1 blind-baked 23cm tart case; 3 eggs; 200ml double cream; 150g gruyere, grated; 60g butter; 2 tbsp olive oil; 1 tsp fresh thyme leaves; 1 tsp sugar; 1 tsp salt and black pepper

A buttery shortcrust tart filled with deeply caramelised onions, gruyere and cream — a French bistro classic.

Total time

95 min

Prep

60 min

Cook

35 min

Difficulty

medium

Cuisine

Vegetarian

vegetarian

Ingredients

1kgwhite onions, very thinly sliced

1blind-baked 23cm tart case

3eggs

200mldouble cream

150ggruyere, grated

60gbutter

2 tbspolive oil

1 tspfresh thyme leaves

1 tspsugar

1 tspsalt and black pepper

Instructions

Melt butter and oil in a large pan, add onions and sugar.

Cook on low heat 45 minutes stirring regularly until very dark golden.

Add thyme and season well.

Cool slightly.

Whisk eggs with cream and most of the gruyere.

Mix in caramelised onions.

Pour into blind-baked tart case, scatter remaining gruyere on top.

Bake at 175C for 30 minutes until just set.

Nutrition (estimated)

Per serving, based on a standard 4-serving portion and standard nutrition references — not a lab or USDA-verified measurement.

Calories

705

Protein

19.8g

Fat

58.9g

Carbs

26.2g

Fiber

4.3g

Sodium

451mg

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