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French Onion Tart
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
1
Melt butter and oil in a large pan, add onions and sugar.
2
Cook on low heat 45 minutes stirring regularly until very dark golden.
3
Add thyme and season well.
4
Cool slightly.
5
Whisk eggs with cream and most of the gruyere.
6
Mix in caramelised onions.
7
Pour into blind-baked tart case, scatter remaining gruyere on top.
8
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
Reviews
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★★★★★
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