Does anyone have a good recipe for millionaire's shortbread ?

[JustinBiebermakesmevom]

I made it last night with the kids and it was bloody awful.....The caramel filling was far too runny and just ran out the side of the cake.

Thanks in advance.

[PoohBearsHole]

Might not be exactly what you want but ths months good food mag has a billionaires one with peanut butter in. I appreciate if you are allergic to nuts not so good but it made a fabulous billionaires shortbread, made with ready caramelised condensed milk and sugar boiled for a while, it gave various instructions as to how to check it worked :)
Hope that helps, will search it out if I get a chance :)

[TobyLerone]

Here.

Works every time.