Sift the flour and salt into a bowl. Rub in the butter or margarine until the mixture resembles fine breadcrumbs. Stir in just enough water to bind the ingredients, and lightly mix together. Roll out the pastry on a lightly floured surface, then cut out (2 1/2 in) rounds. Use these rounds to line patty tins. Put a small spoonful of jam into each tart. Bake in a 200°C oven for 10-15 minutes or until the pastry is golden. Cool on a wire rack. Serve warm or cold.

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