How a Tim Tam becomes a drinking tube
A Tim Tam is built from two crisp biscuits joined by chocolate cream and covered in chocolate. Bite off opposite corners—one at each end—and the exposed biscuit layers form a narrow route through the sandwich. Put one corner in a hot drink and sip through the other. The liquid is drawn through the biscuit by capillary action: the same tendency that lets a paper towel pull up a spill.
The biscuit is doing two jobs at once. Its crumbly layers let a little liquid pass, while the filling and outer coating help keep the drink from immediately escaping through the sides.
Why the trick ends in a collapse
Heat and moisture gradually soften the biscuit and filling. That makes the route easier to sip through at first, but it also weakens the structure holding the snack together. Leave it in the drink too long and the softened layers can no longer support the chocolate shell; the whole thing gives way.
The narrow window is part of the appeal: sip while the biscuit still holds, then eat it before the warmed chocolate and crumbs fall apart. It turns a packaged Australian biscuit into a brief, hands-on tea or coffee ritual.
