Preheat the oven to 200C (180C fan-assisted, 390F)
Use a food processor and whizz up those breadcrumbs
Get the shortcrust pastry out of the packet fresh from the fridge and line your tin with it. It won't reach fully across two of the sides but don't sweat it Susan. Simply snip off the pastry that hangs over the other edges and use the lengths to make up the sides that It doesn't reach fully across. Gently press the strips of pastry into the other pastry edges to make up the sides and snip off any excess so that you don't have a couple of bulky edges where the pastry meets.
Press a fork all over the base. This stops air pockets getting all excited and puffing up the pastry...honestly it's a thing.
Line with baking paper and pour on in some baking beans or similar. Make sure the baking paper comes up over the sides.
Bake for 10 minutes, then remove from the oven and carefully remove the beans (they're hot!) and the baking paper. Bake for another 5 minutes uncovered before taking out and setting to the side.
Mix the egg and cream together in a cutesy little bowl.
Warm the syrup, salt and lemon juice up in a saucepan over a gentle heat until warm but NOT boiling. Pour on in the eggy mix.
Stir it all well through and pour it all into the breadcrumb bowl
Stir it all up good & sticky.
Pile it all into that pastry case and smoosh it level.
Turn down the oven to 180C/350 F. Bake that beauty for 35-40 minutes until it's set and busy going about it's browning business on the top.
Let it cool quite a bit in the tin, then remove carefully from the tin and slice into soft,sticky golden wedges with a sharp knife.