1Position a rack in the center of the oven and heat the oven to 425°F.
Line a baking sheet with parchment. Combine the sugar and cinnamon in a small bowl. Unroll or unfold the puff pastry on a lightly floured surface. Pinch any creases together and then smooth them out with your fingertips. Cut the pastry sheet into four equal squares and transfer them to the lined baking sheet.
2Roll 1-1/2 tsp. of almond paste into a small ball, flatten it slightly with the palm of your hand, and put it in the center of one puff pastry square. Drop 1 tsp. of sour cream on top. Sprinkle about 1/2 Tbs. of the cinnamon sugar over the sour cream. Arrange four pear wedges in the center of the puff pastry, two leaning away from the center one way and two leaning the other way. Sprinkle with another 1/2 Tbs. of the cinnamon sugar. Repeat with the remaining three puff pastry squares and filling ingredients—you won’t need all of the sliced pears.
3Fold the corners of the puff pastry over the pears until the tips are just touching but not overlapping and press the dough against the pears. (The tarts won’t look pretty now, but they’ll be beautiful once they bake and puff up.) Bake until puffed and golden brown on the edges, 22 to 27 minutes. Let cool. Any juices that leak onto the baking sheet will harden to a candy-like consistency, so break off and discard these bits before serving.
4Serve topped with some vanilla ice cream (optional).
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