02Heat oven to 375 degrees. Cut dough into 8 equal pieces. Roll each piece between sheets of plastic wrap into 1/8-inch-thick rounds (about 6 inches in diameter). Place pastry rounds on one or two baking sheets that have been lined with parchment paper or nonstick liners. Chill rounds while preparing filling.03For filling, in a food processor, combine almonds with 1 tablespoon of sugar. Pulse until mixture becomes a fine meal (avoid over-processing). Add butter, 2 eggs, flour, vanilla and salt and process until combined.04In a bowl, beat remaining egg with 1 tablespoon water. Brush this egg wash over prepared pastry rounds. Spoon about 2 tablespoons almond filling in center of each pastry round and spread it to within 2 inches of the edge. Arrange plum slices in a spiral over filling. Sprinkle raw sugar generously over plums. Fold edges of tart dough up over edges of plums. Dough will overlap.05Bake tarts until pastry is golden brown, about 18 to 20 minutes. Serve warm with whipped creme fraiche or vanilla ice cream.