Upside Down Caramelized Leek Tart
Ingredients
- 1 14-oz. package frozen puff pastry, thawed
- All-purpose flour (for surface)
- 6 leeks, root ends and dark green parts removed, cut in half lengthwise
- 2 Tbsp. extra-virgin olive oil
- ½ tsp. kosher salt
- ½ tsp. freshly ground black pepper, plus more
- ¼ cup white wine vinegar
- 2 Tbsp. unsalted butter
- 1 tsp. sugar
- 1 tsp. thyme leaves, plus more for serving
- 2 Tbsp. Dijon mustard
- 2 oz. Parmesan, finely grated (about ½ cup)
- Flaky sea salt
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