For the pastry,
sift the flour and salt into a bowl. Add the butter
and margarine and rub in until the mixture resembles
coarse breadcrumbs. Stir in just enough water to
bind the dough. Wrap and chill for 20 minutes. Roll
out the pastry to a 5mm/ 1/4in thickness. Use to line
a 2Ocm/8in tart tin. Trim and chill until needed.,
In a saucepan,
combine 165g/5 1/2oz/3/4 cup of the sugar and the
orange juice and boil until thick and syrupy. Cut
the unpeeled oranges into 5mm/ 1/4in slices. Add to the
syrup. Simmer gently for 10 minutes. Put on a wire
rack to dry. When cool, cut in half. Reserve the
syrup. Place a baking sheet in the oven and heat to
200"C/ 400"F /Gas 6.
Grind the almonds
finely in a blender or food processor. Cream the
butter and remaining sugar until light and fluffy.
Beat in the egg and 30ml/2 tbsp of the orange syrup.
Stir in the almonds and flour.
Melt the jam over
a low heat, then brush over the pastry case. our in
the almond mixture. Bake on the baking sheet until
set, about 20 minutes, then cool. Arrange
overlapping orange slices on top. Boil the remaining
syrup until thick and brush on top to glaze.