3 T. butter

1 T. olive oil

4 sweet (Walla-Walla, Maui, or Vidalia) or yellow onions (2 lb. total), peeled and sliced very thinly

1 firm-ripe pear (8 oz.), rinsed and cut in half crosswise, then lengthwise

 Salt and pepper

2 sheets puff pastry, thawed but kept cool

7 oz. (1 1/2 C.) crumbled gorgonzola or other blue cheese

 

In a 12-inch frying pan over medium heat, melt the butter with the olive oil. Add the sliced onion and reduce heat slightly (between medium and medium-low). Cook, stirring occasionally, until the onions soften and turn brown, 30 to 40 minutes. Meanwhile, trim the pear quarters to remove seeds, then cut into thin slices; set aside. When onions are done, sprinkle with salt and pepper to taste and set aside to cool to room temperature. Preheat oven to 375° (convection oven not recommended). Line two 14- by 17-inch sheet pans with parchment paper and transfer one sheet of pastry dough to each. Roll out pastry lightly with a floured rolling pin to flatten any creases. Using a pizza cutter or sharp knife, cut the pastry sheets into triangle, wedge, or diamond-shaped pieces about 2 inches wide (don’t worry if you cut through parchment). Slightly separate pieces so that they are not touching. Lay a pear slice in the center of each wedge (trim the slice so that it doesn’t cover the entire pastry). Top with a small pile of caramelized onions and about 1/2 tsp. of the gorgonzola or blue cheese. Bake in oven until fully puffed and golden, about 25 to 30 minutes. Serve warm.  Do-ahead tips: Cook the onions up to 2 days ahead. Store onions in an airtight container in the refrigerator. Slice pears, prepare puff pastry, and bake just before serving.