Heat the oven to 190C/fan 170C/gas 5. Roll out the pastry between 2 lengths of clingfilm and line a 22-23cm loose-based tart tin. Line with greaseproof paper and baking beans and blind bake for 10-15 minutes or until the pastry looks set and dried. Lift out the paper and dry the base of the tart out in the oven for a couple of minutes. Turn the oven down to 160C/fan 140C/gas 3.
Mix the syrup, breadcrumbs, lemon juice and zest, and eggs with a pinch of salt. Pour into the tart and bake for 50 minutes or until the filling has lightly set. Leave to cool.