Tarte Tatin aux Oignons (Savoury Onion Tarte Tatin)
Why this recipe works
- Crisp pastry, soft onions: Baking the puff pastry over the onions keeps it lifted and flaky while the onions turn tender and glossy underneath.
- Sweetness with balance: Balsamic vinegar cuts through the butter and caramelised sugar, giving the tart a savoury edge rather than a purely sweet finish.
- Upside-down structure: The tarte Tatin method lets the onions caramelise against the tin, creating a polished top once the tart is inverted.
Get the most out of this recipe
Timing notes
- Rest before turning out: Let the tart stand briefly after baking so the caramel loosens slightly and releases more cleanly from the tin.
- Serve while warm: The tart is at its best soon after baking, when the onions are glossy and the pastry still has a crisp edge.
Texture tips
- Keep the wedges intact: Cut the onions into thick wedges and turn them gently in the pan so they hold their shape when the tart is inverted.
- Bake until deeply golden: A well-coloured pastry top before inversion gives the tart better structure and a more satisfying flaky finish.
Common mistakes
- Caramel too tight: If the caramel seems stiff after baking, avoid forcing the tart out immediately; a short rest helps the juices loosen.
- Turning out too late: Do not leave the tart in the tin for too long, as the caramel can firm up and make a clean release harder.
Serving ideas
- Serve with salad: A crisp green salad with a sharp vinaigrette balances the buttery pastry and sweet onions.
- Finish with herbs: Fresh thyme adds a clean herbal note; rosemary works well if you prefer a stronger, more resinous finish.
Equipment you'll need
Ingredients
Instructions
- Heat the oven to 200°C (390°F). Peel the onions, then cut them into thick wedges, keeping the layers as intact as you can so they hold their shape.
- Melt the butter in a frying pan over medium heat. Add the onions and cook for 12 to 15 minutes, turning carefully, until softened and starting to take on colour.
- Sprinkle over the caster sugar and cook for 3 to 5 minutes until it melts and turns glossy. Stir in the balsamic vinegar and black pepper, then cook for 1 minute to coat the onions in the caramel.
- Tip the onions and all the caramel into a tart tin and arrange the wedges snugly in a single layer. Lay the puff pastry over the top, tucking the edges down around the onions inside the tin.
- Bake for 25 to 30 minutes until the pastry is puffed and deep golden. Rest for 5 minutes, then run a spatula around the edge and invert onto a serving plate in one confident movement.
- Strip the thyme leaves from the sprigs and scatter over the warm tart. Slice and serve straight away while the onions are glossy and the pastry is crisp.
Recipe notes
Tips
- Keep the onion wedges chunky so they stay intact when you invert the tart.
- If the caramel looks a little tight after baking, let the tart stand for 5 minutes before turning out so the juices loosen and release cleanly.
- For the neatest finish, invert onto a plate with a slight rim to catch any hot caramel.
Substitutions
- Replace balsamic vinegar with sherry vinegar for a lighter, sharper tang.
- Replace fresh thyme with fresh rosemary for a more robust, piney finish.
Storage
- Refrigerate up to 2 days
- Cool completely, then refrigerate. Reheat on a baking tray in a 180°C (355°F) oven for 10 to 12 minutes until hot and the pastry has re-crisped.
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Recipe overview
- Servings: 4 servings
- Total time: 1h (25min active)
- Difficulty: Medium
- Cuisine: French
-
Allergens:
Gluten Milk Wheat
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