Apple, Aged Cheddar & Caramelized Onion Tart
A simple savoury tart that brings together sweet Ontario apples, sharp aged cheddar, and rich caramelized onions.
Ingredients
- 1 sheet puff pastry, thawed
- 2 medium apples, thinly sliced
- 1 large yellow onion, thinly sliced
- 1 1/2 cups aged cheddar, grated
- 1 tablespoon butter
- 1 tablespoon olive oil
- 1 teaspoon fresh thyme leaves, plus extra for garnish
- 1 teaspoon grainy Dijon mustard
- 1 egg, beaten
- Salt and freshly ground black pepper
Method
- Preheat the oven to 400°F (200°C) and line a baking sheet with parchment paper.
- Heat the butter and olive oil in a skillet over medium-low heat. Add the sliced onion and a small pinch of salt. Cook slowly for about 15–20 minutes, stirring occasionally, until the onions are soft, golden, and caramelized.
- Place the puff pastry on the prepared baking sheet. Lightly score a border about 1 inch from the edge, being careful not to cut all the way through.
- Spread the Dijon mustard inside the scored border.
- Sprinkle about two-thirds of the grated aged cheddar evenly over the pastry.
- Arrange the caramelized onions and sliced apples over the cheese, slightly overlapping the apple slices.
- Sprinkle with thyme, black pepper, and the remaining cheddar.
- Brush the exposed pastry border with the beaten egg.
- Bake for 20–25 minutes, or until the pastry is puffed and golden and the cheese is melted.
- Allow the tart to rest for about 5 minutes before slicing. Garnish with a little extra fresh thyme and serve warm.
A sharp, nutty aged cheddar works especially well here because it balances the sweetness of the apples and onions without disappearing into the pastry.