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On Friday, 8 November 2019 20:32:33 UTC, Tim Lamb wrote:
Why is it the packs of Tucs cheese biscuits invariably arrive broken or
weakened such that they snap as the cheese is applied?

You're not supposed to apply cheese directly to the Tuc biscuit. The force
of doing that, as well as placing a Tuc against a flat or curved plate,
will cause stresses within the biscuit structure leading to catastrophic
fracture failure.

The correct technique is to:

(a) place the Tuc biscuit on a surface that will support the biscuit. A
silicone baking sheet may be suitable.

(b) apply a layer of butter to the Tuc biscuit with a knife, ensuring that
the film of butter always acts as a cushion between the knife and the
biscuit.

(c) gently lower the cheese onto the top of the Tuc biscuit until surface
tension of the butter film adheres to the cheese but the cheese does not
apply force onto the Tuc biscuit.

Any Tucs that arrive already broken should be put aside and used as a
crunchy toppping for macaroni cheese.

You never use butter, you barbarian.