if you cross butter, flour, and a wooly jumper [cross]

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Hi,

I am watching "The Great British Bake off" and there is a line that I don't understand.
In a scene, the MC says to the other MC "what do you get if you cross butter, flour, a crime scene and a woolly jumper. It is a Danish pastry"
I don't understand this context.
Is this a joke?
Would someone explain please?

Thank you!

 

[Uncle Jack]

It is a joke (which I fail to understand, by the way). "Cross" is used in the way that animal breeders use it. You cross a labrador retriever with a poodle to get a labradoodle, for instance.

 

[sound shift]

The heroine of the Danish television crime series "The Killing", a drama that brought 'Scandi Noir' to a wide-ish audience in the UK, wore a Fair Isle jumper pretty well all the time - hence the jumper and the crime scene. It's too much of an "in" joke, especially as the series finished several years ago now.

 

[Hermione Golightly]

It's a variation of a traditional joke form, "What do you get if you cross X with Y?", or "If you mate X with Y what sort of offspring results?"

Q. What do you get if you cross a sheep with a kangaroo?
A. A woolly jumper!

Q. What do you get if you cross a rabbit with a kangaroo?
A. Great big holes all over Australia!

Q.What do you get if you cross a crocodile with a flower?
A. I don't know but I'm not going to smell it!

 

[RM1(SS)]

Another variation was often heard on the old TV show Hee Haw.
A: I crossed an X with a Y.
B: What did you get?
A: A Z.

The only actual example I can remember, alas:
"I crossed a river with a leaky rowboat."
"What did you get?"
"A pocket full of catfish."