In a bowl, combine the ground almonds, ¼ cup (55 g) of the sugar, the butter, flour and egg. Spread over the dough, leaving a ½-inch (1.5 cm) border all the way around. Top the almond mixture with the pineapple slices, overlapping them in concentric circles. Brush the dough with milk. Sprinkle the remaining sugar over the tart.