Balsamic-Red Onion, Chard & Gorgonzola Tart
This tart looks impressive, but it comes together very quickly with the use of purchased puff pastry. Vary the recipe by using different toppings, such as roasted fennel, tomatoes and black olives or zucchini, feta and thyme. The tart can be made a day ahead, refrigerated and served at room temperature or rewarmed gently in a 350°F (180°C) oven. Cut it into smaller squares for a terrific party appetizer.
Ingredients:
- 3 Tbs. olive oil
- 2 small red onions, halved and cut into 1-inch (2.5-cm) pieces
- Kosher salt and freshly ground pepper
- 2 Tbs. balsamic vinegar
- 1 small bunch Swiss chard, stemmed and cut into 1-inch (2.5-cm) pieces
- All-purpose flour for rolling
- 1 sheet frozen puff pastry (half of a 17-oz./530-g package), thawed
- 1/4 lb. (125 g) Gorgonzola cheese, crumbled
- 1 egg, lightly beaten
Directions:
Preheat an oven to 400°F (200°C). Line a baking sheet with parchment paper.
In a fry pan over high heat, warm 2 Tbs. of the olive oil. Add the onions and sauté until soft, about 4 minutes. Reduce the heat to low and season with salt and pepper. Cook slowly, stirring occasionally, until the onions turn a deep brown, about 10 minutes. Add the balsamic vinegar and cook until the liquid is absorbed, about 2 minutes longer. Transfer the onions to a bowl.
Return the pan to medium-high heat; do not wipe the pan clean. Warm the remaining 1 Tbs. olive oil and add the chard. Season with salt and pepper and sauté, tossing the chard to coat in the oil, just until beginning to wilt, about 3 minutes. Transfer to the bowl with the onions, toss to combine and let cool.
On a floured work surface, roll out the puff pastry into a 10-by-14-inch (25-by-35-cm) rectangle. Fold over 1 inch (2.5 cm) of each side of the dough to create a border. Fold the dough gently in half, center it on the prepared baking sheet and unfold.
Prick the dough all over with the tines of a fork. Distribute the chard and onion mixture evenly around the tart and top with the cheese, leaving the borders uncovered. Brush the borders of the tart with the egg. Bake until golden brown, 22 to 25 minutes. Let cool slightly, then cut into squares and serve. Serves 4.
Adapted from Williams-Sonoma School Night, by Kate McMillan (Weldon Owen, 2015)
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