|2||medium yellow onions, peeled, cut in half and sliced into 1/4-inch thick semi-circles|
|2 tbsp||(30 mL) unsalted butter|
|1 tbsp||(15 mL) olive oil|
|1 tsp||(5 mL) coarse sea salt|
|1 tsp||(5 mL) fresh thyme leaves|
|1/2 tsp||(2 mL) fresh cracked black pepper|
|Pinch of granulated sugar|
|1/4 cup||(60 mL) beer, white wine or beef broth|
|For the Puffs:|
|1 Pkg||Tenderflake® Puff Pastry, thawed but still cold|
|1||large egg, beaten|
|1/3 cup||finely grated Gruyère cheese|
|1 tsp||(5 mL) coarse salt for garnish|
PREHEAT the oven to 400F(200C). Line a baking sheet with parchment paper.
MELT butter and olive oil in a heavy skillet over medium high heat. Add the sliced onions all at once, stirring to coat the onions. Allow onions to cook, undisturbed, for about 4 minutes. Add salt, thyme, pepper, and sugar, and stir. Reduce heat to low; cover and cook, stirring occasionally, until the onions are deep brown and very soft, about 15 min. Stir in broth (or beer or wine), scraping any brown bits from the bottom of the pan. Let cool completely.
ROLL out the thawed Tenderflake® Puff Pastry on a lightly floured work surface. Use a 2½ inch (7cm) round cookie cutter to cut circles out of the pastry. Two sheets should produce 24 pastry rounds.
BRUSH each round lightly with egg. Top 12 of the pastry rounds with a scant tablespoonful of caramelized onions and 1 teaspoonful grated cheese.
Carefully place the remaining pastry rounds over the onion and cheese mixture. Use the tines of a fork around the edge of each pastry round to secure the pastry together.
ARRANGE the filled pastries on the prepared sheet about 2 inches (5 cm) apart and brush lightly with egg. Prick the top of each pastry with the tines of a fork for ventilation and sprinkle with coarse salt. Bake for 12 to 15 minutes, or until puffed and dark golden brown. Remove from the oven and allow to cool for at least 5 minutes before serving.
Tip: These pastries can be made ahead and frozen on the baking sheet for one hour. Once they are frozen, transfer them to a re-sealable bag and bake as above from frozen, adding about 5 minutes to the baking time.
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